mermaid-runtime 0.13.0

Daemon-safe runtime core for Mermaid
Documentation
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
use std::fmt;
use std::path::{Path, PathBuf};
use std::sync::OnceLock;
use std::sync::atomic::{AtomicU64, Ordering};
use std::time::{SystemTime, UNIX_EPOCH};

use anyhow::{Context, Result};
use directories::ProjectDirs;
use rusqlite::types::Type;
use rusqlite::{Connection, OptionalExtension, params};
use serde::{Deserialize, Serialize};

// Bumped to 3 for the F75 covering indexes (pending-approval and reconcile
// scans). They are additive, but the bump lets a DB already at v2 re-run the
// migration once to pick them up. The bump is load-bearing alongside the F17
// early-return in `init_schema`: a DB at an older version still runs the
// migration (the idempotent baseline plus any per-version step dispatched by
// `migrate_within_txn`) exactly once, while an already-current DB skips the
// write lock entirely.
//
// History: v2 added the additive `tasks.owner_kind` column (F18/RC-E).
const SCHEMA_VERSION: i32 = 3;

/// `tasks.owner_kind` value for a task the daemon runs in-process. Only these are
/// reset by `reconcile_after_restart`; a `NULL` owner (an interactive CLI run, or
/// any other creator) is left alone so a live `mermaid` session that shares the
/// store isn't wrongly failed on daemon startup (F18/RC-E).
const OWNER_KIND_DAEMON: &str = "daemon";

/// Durable task state. A task is the daemon-level work unit; a chat
/// transcript is just one artifact linked to it.
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum TaskStatus {
    Queued,
    Running,
    WaitingForApproval,
    Blocked,
    Completed,
    Failed,
    Cancelled,
}

impl TaskStatus {
    pub fn as_str(self) -> &'static str {
        match self {
            TaskStatus::Queued => "queued",
            TaskStatus::Running => "running",
            TaskStatus::WaitingForApproval => "waiting_for_approval",
            TaskStatus::Blocked => "blocked",
            TaskStatus::Completed => "completed",
            TaskStatus::Failed => "failed",
            TaskStatus::Cancelled => "cancelled",
        }
    }

    fn from_db(value: &str) -> std::result::Result<Self, UnknownRuntimeEnum> {
        match value {
            "queued" => Ok(TaskStatus::Queued),
            "running" => Ok(TaskStatus::Running),
            "waiting_for_approval" => Ok(TaskStatus::WaitingForApproval),
            "blocked" => Ok(TaskStatus::Blocked),
            "completed" => Ok(TaskStatus::Completed),
            "failed" => Ok(TaskStatus::Failed),
            "cancelled" => Ok(TaskStatus::Cancelled),
            other => Err(UnknownRuntimeEnum::new("task status", other)),
        }
    }
}

impl fmt::Display for TaskStatus {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(self.as_str())
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum TaskPriority {
    Low,
    Normal,
    High,
}

impl TaskPriority {
    pub fn as_str(self) -> &'static str {
        match self {
            TaskPriority::Low => "low",
            TaskPriority::Normal => "normal",
            TaskPriority::High => "high",
        }
    }

    fn from_db(value: &str) -> std::result::Result<Self, UnknownRuntimeEnum> {
        match value {
            "low" => Ok(TaskPriority::Low),
            "normal" => Ok(TaskPriority::Normal),
            "high" => Ok(TaskPriority::High),
            other => Err(UnknownRuntimeEnum::new("task priority", other)),
        }
    }
}

impl fmt::Display for TaskPriority {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.write_str(self.as_str())
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum ProcessStatus {
    Running,
    Exited,
    Unknown,
}

impl ProcessStatus {
    pub fn as_str(self) -> &'static str {
        match self {
            ProcessStatus::Running => "running",
            ProcessStatus::Exited => "exited",
            ProcessStatus::Unknown => "unknown",
        }
    }

    fn from_db(value: &str) -> std::result::Result<Self, UnknownRuntimeEnum> {
        match value {
            "running" => Ok(ProcessStatus::Running),
            "exited" => Ok(ProcessStatus::Exited),
            "unknown" => Ok(ProcessStatus::Unknown),
            other => Err(UnknownRuntimeEnum::new("process status", other)),
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct TaskRecord {
    pub id: String,
    pub title: String,
    pub status: TaskStatus,
    pub priority: TaskPriority,
    pub project_path: String,
    pub model_id: String,
    pub conversation_id: Option<String>,
    pub created_at: String,
    pub updated_at: String,
    pub final_report: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct TaskTimelineEvent {
    pub id: i64,
    pub task_id: String,
    pub kind: String,
    pub message: String,
    pub created_at: String,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct SessionRecord {
    pub id: String,
    pub project_path: String,
    pub model_id: String,
    pub title: Option<String>,
    pub conversation_path: Option<String>,
    pub created_at: String,
    pub updated_at: String,
    pub total_tokens: Option<i64>,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewSession {
    pub id: Option<String>,
    pub project_path: String,
    pub model_id: String,
    pub title: Option<String>,
    pub conversation_path: Option<String>,
    pub total_tokens: Option<i64>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct MessageRecord {
    pub id: i64,
    pub session_id: String,
    pub role: String,
    pub content_json: String,
    pub created_at: String,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewMessage {
    pub session_id: String,
    pub role: String,
    pub content_json: String,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewTask {
    pub title: String,
    pub project_path: String,
    pub model_id: String,
    pub priority: TaskPriority,
    pub conversation_id: Option<String>,
    /// Which kind of process owns this task. `Some("daemon")` (set via
    /// [`Self::daemon_owned`]) marks a task the daemon runs in-process, so the
    /// startup reconcile may fail it if a crash left it `Running`. `None` — the
    /// default, used by interactive CLI runs and any other creator — is left
    /// untouched by reconcile so a live session isn't clobbered (F18/RC-E).
    pub owner_kind: Option<String>,
}

impl NewTask {
    pub fn new(
        title: impl Into<String>,
        project_path: impl Into<String>,
        model_id: impl Into<String>,
    ) -> Self {
        Self {
            title: title.into(),
            project_path: project_path.into(),
            model_id: model_id.into(),
            priority: TaskPriority::Normal,
            conversation_id: None,
            owner_kind: None,
        }
    }

    /// Mark this task as daemon-owned (run in the daemon process). Only such
    /// tasks are reset by [`RuntimeStore::reconcile_after_restart`]; omit it for
    /// interactive CLI runs so they survive a daemon restart.
    pub fn daemon_owned(mut self) -> Self {
        self.owner_kind = Some(OWNER_KIND_DAEMON.to_string());
        self
    }
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct ApprovalRecord {
    pub id: String,
    pub task_id: Option<String>,
    pub proposed_action: String,
    pub risk_classification: String,
    pub policy_decision: String,
    pub user_decision: Option<String>,
    pub args_summary: Option<String>,
    pub checkpoint_id: Option<String>,
    pub pending_action_json: Option<String>,
    pub created_at: String,
    pub decided_at: Option<String>,
    pub archived_at: Option<String>,
    pub archive_reason: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewApproval {
    pub task_id: Option<String>,
    pub proposed_action: String,
    pub risk_classification: String,
    pub policy_decision: String,
    pub args_summary: Option<String>,
    pub checkpoint_id: Option<String>,
    pub pending_action_json: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct ToolRunRecord {
    pub id: String,
    pub task_id: Option<String>,
    pub turn_id: Option<String>,
    pub call_id: Option<String>,
    pub tool_name: String,
    pub status: String,
    pub args_json: Option<String>,
    pub output_json: Option<String>,
    pub started_at: String,
    pub finished_at: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewToolRun {
    pub id: Option<String>,
    pub task_id: Option<String>,
    pub turn_id: Option<String>,
    pub call_id: Option<String>,
    pub tool_name: String,
    pub args_json: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct ProcessRecord {
    pub id: String,
    pub task_id: Option<String>,
    pub pid: u32,
    pub command: String,
    pub cwd: Option<String>,
    pub log_path: Option<String>,
    pub detected_url: Option<String>,
    pub status: ProcessStatus,
    pub health: Option<String>,
    pub created_at: String,
    pub updated_at: String,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewProcess {
    pub id: Option<String>,
    pub task_id: Option<String>,
    pub pid: u32,
    pub command: String,
    pub cwd: Option<String>,
    pub log_path: Option<String>,
    pub detected_url: Option<String>,
    pub status: ProcessStatus,
    pub health: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct CheckpointRecord {
    pub id: String,
    pub task_id: Option<String>,
    pub project_path: String,
    pub snapshot_path: String,
    pub changed_files_json: String,
    pub pending_action_json: Option<String>,
    pub approval_id: Option<String>,
    pub created_at: String,
    pub archived_at: Option<String>,
    pub archive_reason: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewCheckpoint {
    pub id: Option<String>,
    pub task_id: Option<String>,
    pub project_path: String,
    pub snapshot_path: String,
    pub changed_files_json: String,
    pub pending_action_json: Option<String>,
    pub approval_id: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct CompactionRecord {
    pub id: String,
    pub task_id: Option<String>,
    pub session_id: Option<String>,
    pub source_token_estimate: Option<i64>,
    pub summary_token_count: Option<i64>,
    pub preserved_turns: Option<i64>,
    pub archive_path: Option<String>,
    pub verification_status: Option<String>,
    pub created_at: String,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewCompaction {
    pub id: Option<String>,
    pub task_id: Option<String>,
    pub session_id: Option<String>,
    pub source_token_estimate: Option<i64>,
    pub summary_token_count: Option<i64>,
    pub preserved_turns: Option<i64>,
    pub archive_path: Option<String>,
    pub verification_status: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct PluginInstallRecord {
    pub id: String,
    pub name: String,
    pub source: String,
    pub version: Option<String>,
    pub enabled: bool,
    pub manifest_json: String,
    pub installed_at: String,
    pub updated_at: String,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewPluginInstall {
    pub id: Option<String>,
    pub name: String,
    pub source: String,
    pub version: Option<String>,
    pub enabled: bool,
    pub manifest_json: String,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct ProviderProbeRecord {
    pub provider: String,
    pub model_id: String,
    pub capability_key: String,
    pub capability_value: String,
    pub confidence: String,
    pub error: Option<String>,
    pub probed_at: String,
}

#[derive(Debug, Clone, PartialEq, Eq)]
pub struct NewProviderProbe {
    pub provider: String,
    pub model_id: String,
    pub capability_key: String,
    pub capability_value: String,
    pub confidence: String,
    pub error: Option<String>,
}

#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct PairingTokenRecord {
    pub id: String,
    pub token_hash: String,
    pub label: Option<String>,
    pub enabled: bool,
    pub created_at: String,
    pub last_used_at: Option<String>,
    /// RFC3339 expiry. `None` = never expires (opt-in via `--ttl-days 0`).
    pub expires_at: Option<String>,
}

/// SQLite-backed durable runtime state.
pub struct RuntimeStore {
    conn: Connection,
    path: PathBuf,
}

impl RuntimeStore {
    pub fn open_default() -> Result<Self> {
        let dir = data_dir()?;
        std::fs::create_dir_all(&dir)
            .with_context(|| format!("failed to create Mermaid data dir {}", dir.display()))?;
        // The data dir holds the daemon control socket, pairing tokens, and
        // session/memory state. Restrict it to the owning user (0700) so no
        // other local UID can reach the socket or read the DB.
        #[cfg(unix)]
        {
            use std::os::unix::fs::PermissionsExt;
            let _ = std::fs::set_permissions(&dir, std::fs::Permissions::from_mode(0o700));
        }
        // Windows has no mode bits, so the DB (token hashes, transcripts) would
        // otherwise inherit the parent's default ACL. Lock it to the current
        // user via `icacls`. A sentinel makes this run once (first open, or
        // first open after upgrade for an already-loose dir) rather than on
        // every store open — the daemon opens the store per request. Best-effort
        // like the Unix branch: never fail the store open on an ACL hiccup.
        #[cfg(windows)]
        {
            let sentinel = dir.join(".acl-hardened");
            if !sentinel.exists()
                && let Ok(user) = std::env::var("USERNAME")
                && !user.is_empty()
            {
                let hardened = std::process::Command::new("icacls")
                    .arg(&dir)
                    .arg("/inheritance:r")
                    .arg("/grant:r")
                    .arg(format!("{user}:(OI)(CI)F"))
                    .arg("/T")
                    .stdout(std::process::Stdio::null())
                    .stderr(std::process::Stdio::null())
                    .status()
                    .map(|status| status.success())
                    .unwrap_or(false);
                if hardened {
                    let _ = std::fs::write(&sentinel, b"1");
                }
            }
        }
        Self::open(dir.join("runtime.sqlite3"))
    }

    pub fn open(path: impl AsRef<Path>) -> Result<Self> {
        let path = path.as_ref().to_path_buf();
        if let Some(parent) = path.parent() {
            std::fs::create_dir_all(parent).with_context(|| {
                format!("failed to create SQLite parent dir {}", parent.display())
            })?;
        }
        let conn = Connection::open(&path)
            .with_context(|| format!("failed to open runtime DB {}", path.display()))?;
        // The daemon, CLI, and per-turn effect tasks each open their own
        // connection (often in separate processes). Without WAL + a busy
        // timeout, a writer holding the DB makes a concurrent write fail
        // immediately with SQLITE_BUSY (lost task/tool/approval updates).
        // WAL allows concurrent readers with a single writer; busy_timeout
        // serializes writers gracefully.
        conn.busy_timeout(std::time::Duration::from_secs(5))
            .context("failed to set SQLite busy_timeout")?;
        // `foreign_keys` is connection-scoped and can only be toggled in
        // autocommit mode, so it lives here (per connection) rather than inside
        // the now-transactional `init_schema` migration, where a PRAGMA
        // foreign_keys would be a silent no-op.
        conn.execute_batch(
            "PRAGMA journal_mode=WAL; PRAGMA synchronous=NORMAL; PRAGMA foreign_keys=ON;",
        )
        .context("failed to set SQLite connection PRAGMAs")?;
        let store = Self { conn, path };
        store.init_schema()?;
        Ok(store)
    }

    pub fn path(&self) -> &Path {
        &self.path
    }

    pub fn sessions(&self) -> SessionsRepo<'_> {
        SessionsRepo { conn: &self.conn }
    }

    pub fn messages(&self) -> MessagesRepo<'_> {
        MessagesRepo { conn: &self.conn }
    }

    pub fn tasks(&self) -> TasksRepo<'_> {
        TasksRepo { conn: &self.conn }
    }

    pub fn tool_runs(&self) -> ToolRunsRepo<'_> {
        ToolRunsRepo { conn: &self.conn }
    }

    pub fn approvals(&self) -> ApprovalsRepo<'_> {
        ApprovalsRepo { conn: &self.conn }
    }

    pub fn processes(&self) -> ProcessesRepo<'_> {
        ProcessesRepo { conn: &self.conn }
    }

    pub fn checkpoints(&self) -> CheckpointsRepo<'_> {
        CheckpointsRepo { conn: &self.conn }
    }

    pub fn compactions(&self) -> CompactionsRepo<'_> {
        CompactionsRepo { conn: &self.conn }
    }

    pub fn plugins(&self) -> PluginsRepo<'_> {
        PluginsRepo { conn: &self.conn }
    }

    pub fn provider_probes(&self) -> ProviderProbesRepo<'_> {
        ProviderProbesRepo { conn: &self.conn }
    }

    pub fn pairing_tokens(&self) -> PairingTokensRepo<'_> {
        PairingTokensRepo { conn: &self.conn }
    }

    /// Recover state stranded by a previous daemon's crash/stop (#120, #118).
    /// A `Running` task's worker died with the daemon, so it can never finish —
    /// mark it `failed` with an event. An approval left in the transient
    /// `approving` claim state (a replay that crashed mid-effect, #118) is reset
    /// to undecided so it reappears as pending and stays re-runnable. Call once
    /// on daemon startup, before serving. Returns `(tasks_reset, claims_released)`.
    ///
    /// F18 (RC-E): only **daemon-owned** running tasks are reset. The store is
    /// shared with interactive `mermaid` CLI runs; their tasks are created with a
    /// `NULL` `owner_kind` and are LEFT RUNNING here, so a live CLI session isn't
    /// wrongly flipped to `failed` (with a spurious "interrupted" event) just
    /// because the daemon restarted. The daemon tags the tasks it runs in-process
    /// via [`NewTask::daemon_owned`].
    pub fn reconcile_after_restart(&self) -> Result<(usize, usize)> {
        let now = now_rfc3339();
        // Take the write lock up front with BEGIN IMMEDIATE rather than a DEFERRED
        // transaction that SELECTs and then upgrades to a write on the first
        // UPDATE: SQLite fails a read→write lock upgrade with SQLITE_BUSY
        // *immediately* (busy_timeout does not retry upgrades), so a CLI holding
        // the write lock at daemon startup would abort recovery. IMMEDIATE instead
        // waits on busy_timeout for the lock (#F21). Mirrors `init_schema`.
        self.conn.execute_batch("BEGIN IMMEDIATE;")?;
        let result = (|| -> Result<(usize, usize)> {
            let running: Vec<String> = {
                let mut stmt = self
                    .conn
                    .prepare("SELECT id FROM tasks WHERE status = 'running' AND owner_kind = ?1")?;
                let ids = stmt.query_map([OWNER_KIND_DAEMON], |row| row.get::<_, String>(0))?;
                ids.collect::<rusqlite::Result<Vec<_>>>()?
            };
            for id in &running {
                self.conn.execute(
                    "UPDATE tasks SET status = 'failed', updated_at = ?2 WHERE id = ?1",
                    params![id, now],
                )?;
                self.conn.execute(
                    "INSERT INTO task_events (task_id, kind, message, created_at)
                     VALUES (?1, ?2, ?3, ?4)",
                    params![
                        id,
                        "interrupted",
                        "task was running when the daemon restarted; marked failed",
                        now
                    ],
                )?;
            }
            let claims_released = self.conn.execute(
                "UPDATE approvals SET user_decision = NULL WHERE user_decision = 'approving'",
                [],
            )?;
            Ok((running.len(), claims_released))
        })();
        match result {
            Ok(v) => {
                self.conn.execute_batch("COMMIT;")?;
                Ok(v)
            },
            Err(e) => {
                let _ = self.conn.execute_batch("ROLLBACK;");
                Err(e)
            },
        }
    }

    /// Best-effort retention GC (#130, F22/RC-F): prune archived
    /// approvals/checkpoints, the events of long-finished tasks, and the
    /// high-churn / old terminal rows of the remaining tables, all older than
    /// `retention_days`. Deletes only archived, finished, or terminal-and-old
    /// rows — **active data is never touched** (a running task, a still-open tool
    /// run, a live process, or a recently-updated session all survive). Returns
    /// the number of rows removed.
    pub fn gc(&self, retention_days: i64) -> Result<u64> {
        let cutoff = (chrono::Utc::now() - chrono::Duration::days(retention_days)).to_rfc3339();
        let tx = self.conn.unchecked_transaction()?;
        let mut removed = 0u64;
        removed += tx.execute(
            "DELETE FROM approvals WHERE archived_at IS NOT NULL AND archived_at < ?1",
            params![cutoff],
        )? as u64;
        removed += tx.execute(
            "DELETE FROM checkpoints WHERE archived_at IS NOT NULL AND archived_at < ?1",
            params![cutoff],
        )? as u64;
        removed += tx.execute(
            "DELETE FROM task_events
             WHERE created_at < ?1
               AND task_id IN (
                   SELECT id FROM tasks
                   WHERE status IN ('completed', 'failed', 'cancelled') AND updated_at < ?1
               )",
            params![cutoff],
        )? as u64;
        // F22 (RC-F): the high-churn growers. `tool_runs` is the fastest — one row
        // per tool call — so prune FINISHED runs past the window (a still-running
        // run has a NULL `finished_at` and is kept).
        removed += tx.execute(
            "DELETE FROM tool_runs WHERE finished_at IS NOT NULL AND finished_at < ?1",
            params![cutoff],
        )? as u64;
        // Exited processes past the window (a live `running`/`unknown` process is
        // kept so the dashboard and `stop`/`restart` still see it).
        removed += tx.execute(
            "DELETE FROM processes WHERE status = 'exited' AND updated_at < ?1",
            params![cutoff],
        )? as u64;
        // Old compaction history — immutable bookkeeping rows, safe to drop once
        // past the window.
        removed += tx.execute(
            "DELETE FROM compactions WHERE created_at < ?1",
            params![cutoff],
        )? as u64;
        // Sessions untouched for the whole window are treated as finished. Delete
        // their messages first (so the freed rows are counted) — the FK cascade
        // would remove them anyway — then the sessions themselves. A session
        // updated within the window is active and is kept along with all its
        // messages.
        removed += tx.execute(
            "DELETE FROM messages
             WHERE session_id IN (SELECT id FROM sessions WHERE updated_at < ?1)",
            params![cutoff],
        )? as u64;
        removed += tx.execute(
            "DELETE FROM sessions WHERE updated_at < ?1",
            params![cutoff],
        )? as u64;
        tx.commit()?;
        Ok(removed)
    }

    fn init_schema(&self) -> Result<()> {
        let conn = &self.conn;
        // Forward-compat gate: read the stored schema version BEFORE writing
        // anything. A DB written by a newer mermaid (higher `user_version`)
        // must be refused, not silently down-labeled. The old code stamped
        // `PRAGMA user_version = 1` inside the CREATE script — before this
        // check — so the guard was dead and an older binary would happily
        // operate (and corrupt) a newer DB.
        let current: i32 = conn.query_row("PRAGMA user_version", [], |row| row.get(0))?;
        anyhow::ensure!(
            current <= SCHEMA_VERSION,
            "runtime DB schema version {} is newer than this build supports ({}); upgrade mermaid",
            current,
            SCHEMA_VERSION
        );

        // F17 (RC-E): the overwhelmingly common case is an already-current DB.
        // The daemon opens a fresh store per request, and the old code ran
        // `BEGIN IMMEDIATE` (the write lock) + the full migration + an
        // unconditional `PRAGMA user_version` write on EVERY open — so even
        // read-only requests serialized on a single writer and grew the WAL. Once
        // the stored version already matches, the schema is in place and there is
        // nothing to migrate or stamp: return before taking any write lock so
        // concurrent readers never contend. The newer-than-supported gate above
        // still runs first, so a newer DB is refused, not skipped.
        if current == SCHEMA_VERSION {
            return Ok(());
        }

        // Older (or fresh, version 0) DB only past this point.
        // Create tables + run column migrations exactly once, even when the
        // daemon and CLI open the DB concurrently: BEGIN IMMEDIATE takes the
        // write lock up front, so a racing process blocks on `busy_timeout`
        // and, once we commit, sees the schema already in place instead of
        // double-running an ALTER and failing the open (the old check-then-
        // ALTER `ensure_column` race).
        conn.execute_batch("BEGIN IMMEDIATE;")?;
        if let Err(error) = self.migrate_within_txn(current) {
            let _ = conn.execute_batch("ROLLBACK;");
            return Err(error);
        }
        conn.execute_batch("COMMIT;")?;

        // Stamp the version only after a successful migration — never before
        // the gate above.
        conn.execute_batch(&format!("PRAGMA user_version = {SCHEMA_VERSION};"))?;
        let version: i32 = conn.query_row("PRAGMA user_version", [], |row| row.get(0))?;
        anyhow::ensure!(
            version == SCHEMA_VERSION,
            "unsupported runtime DB schema version {} (expected {})",
            version,
            SCHEMA_VERSION
        );
        Ok(())
    }

    /// Schema creation + column migrations, run inside the `init_schema`
    /// transaction for a DB upgrading from `from_version`. Idempotent:
    /// `CREATE TABLE IF NOT EXISTS` plus the duplicate-tolerant `ensure_column`
    /// make a re-run a no-op, so a second concurrent opener that wins the lock
    /// after us does no harm.
    fn migrate_within_txn(&self, from_version: i32) -> Result<()> {
        self.conn.execute_batch(
            r#"
            CREATE TABLE IF NOT EXISTS sessions (
                id TEXT PRIMARY KEY,
                project_path TEXT NOT NULL,
                model_id TEXT NOT NULL,
                title TEXT,
                conversation_path TEXT,
                created_at TEXT NOT NULL,
                updated_at TEXT NOT NULL,
                total_tokens INTEGER
            );

            CREATE TABLE IF NOT EXISTS messages (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                session_id TEXT NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
                role TEXT NOT NULL,
                content_json TEXT NOT NULL,
                created_at TEXT NOT NULL
            );
            CREATE INDEX IF NOT EXISTS idx_messages_session_id ON messages(session_id);

            CREATE TABLE IF NOT EXISTS tasks (
                id TEXT PRIMARY KEY,
                title TEXT NOT NULL,
                status TEXT NOT NULL,
                priority TEXT NOT NULL,
                project_path TEXT NOT NULL,
                model_id TEXT NOT NULL,
                conversation_id TEXT,
                created_at TEXT NOT NULL,
                updated_at TEXT NOT NULL,
                final_report TEXT,
                owner_kind TEXT
            );
            CREATE INDEX IF NOT EXISTS idx_tasks_project_status
                ON tasks(project_path, status, updated_at);
            -- F75: `reconcile_after_restart` filters `status = 'running' AND
            -- owner_kind = ?`, which the (project_path, ...) index above cannot
            -- serve (wrong leading column). This covering index does.
            CREATE INDEX IF NOT EXISTS idx_tasks_status_owner
                ON tasks(status, owner_kind);

            CREATE TABLE IF NOT EXISTS task_events (
                id INTEGER PRIMARY KEY AUTOINCREMENT,
                task_id TEXT NOT NULL REFERENCES tasks(id) ON DELETE CASCADE,
                kind TEXT NOT NULL,
                message TEXT NOT NULL,
                created_at TEXT NOT NULL
            );
            CREATE INDEX IF NOT EXISTS idx_task_events_task_id
                ON task_events(task_id, id);

            CREATE TABLE IF NOT EXISTS tool_runs (
                id TEXT PRIMARY KEY,
                task_id TEXT REFERENCES tasks(id) ON DELETE SET NULL,
                turn_id TEXT,
                call_id TEXT,
                tool_name TEXT NOT NULL,
                status TEXT NOT NULL,
                args_json TEXT,
                output_json TEXT,
                started_at TEXT NOT NULL,
                finished_at TEXT
            );
            CREATE INDEX IF NOT EXISTS idx_tool_runs_task_id ON tool_runs(task_id);

            CREATE TABLE IF NOT EXISTS approvals (
                id TEXT PRIMARY KEY,
                task_id TEXT REFERENCES tasks(id) ON DELETE SET NULL,
                proposed_action TEXT NOT NULL,
                risk_classification TEXT NOT NULL,
                policy_decision TEXT NOT NULL,
                user_decision TEXT,
                args_summary TEXT,
                checkpoint_id TEXT,
                pending_action_json TEXT,
                created_at TEXT NOT NULL,
                decided_at TEXT,
                archived_at TEXT,
                archive_reason TEXT
            );
            CREATE INDEX IF NOT EXISTS idx_approvals_task_id ON approvals(task_id);
            -- F75: `list_pending` scans `user_decision IS NULL ORDER BY
            -- created_at`. A partial index over only the pending rows stays tiny
            -- and serves both the filter and the ordering.
            CREATE INDEX IF NOT EXISTS idx_approvals_pending
                ON approvals(created_at)
                WHERE user_decision IS NULL;

            CREATE TABLE IF NOT EXISTS processes (
                id TEXT PRIMARY KEY,
                task_id TEXT REFERENCES tasks(id) ON DELETE SET NULL,
                pid INTEGER NOT NULL,
                command TEXT NOT NULL,
                cwd TEXT,
                log_path TEXT,
                detected_url TEXT,
                status TEXT NOT NULL,
                health TEXT,
                created_at TEXT NOT NULL,
                updated_at TEXT NOT NULL
            );
            CREATE INDEX IF NOT EXISTS idx_processes_task_id ON processes(task_id);
            CREATE INDEX IF NOT EXISTS idx_processes_pid ON processes(pid);

            CREATE TABLE IF NOT EXISTS checkpoints (
                id TEXT PRIMARY KEY,
                task_id TEXT REFERENCES tasks(id) ON DELETE SET NULL,
                project_path TEXT NOT NULL,
                snapshot_path TEXT NOT NULL,
                changed_files_json TEXT NOT NULL,
                pending_action_json TEXT,
                approval_id TEXT REFERENCES approvals(id) ON DELETE SET NULL,
                created_at TEXT NOT NULL,
                archived_at TEXT,
                archive_reason TEXT
            );

            CREATE TABLE IF NOT EXISTS compactions (
                id TEXT PRIMARY KEY,
                task_id TEXT REFERENCES tasks(id) ON DELETE SET NULL,
                session_id TEXT,
                source_token_estimate INTEGER,
                summary_token_count INTEGER,
                preserved_turns INTEGER,
                archive_path TEXT,
                verification_status TEXT,
                created_at TEXT NOT NULL
            );

            CREATE TABLE IF NOT EXISTS provider_probes (
                provider TEXT NOT NULL,
                model_id TEXT NOT NULL,
                capability_key TEXT NOT NULL,
                capability_value TEXT NOT NULL,
                confidence TEXT NOT NULL,
                error TEXT,
                probed_at TEXT NOT NULL,
                PRIMARY KEY (provider, model_id, capability_key)
            );

            CREATE TABLE IF NOT EXISTS plugin_installs (
                id TEXT PRIMARY KEY,
                name TEXT NOT NULL,
                source TEXT NOT NULL,
                version TEXT,
                enabled INTEGER NOT NULL DEFAULT 1,
                manifest_json TEXT NOT NULL,
                installed_at TEXT NOT NULL,
                updated_at TEXT NOT NULL
            );

            CREATE TABLE IF NOT EXISTS pairing_tokens (
                id TEXT PRIMARY KEY,
                token_hash TEXT NOT NULL,
                label TEXT,
                enabled INTEGER NOT NULL DEFAULT 1,
                created_at TEXT NOT NULL,
                last_used_at TEXT,
                expires_at TEXT
            );
            CREATE INDEX IF NOT EXISTS idx_pairing_tokens_enabled
                ON pairing_tokens(enabled, created_at);
            "#,
        )?;

        ensure_column(&self.conn, "approvals", "pending_action_json", "TEXT")?;
        ensure_column(&self.conn, "approvals", "archived_at", "TEXT")?;
        ensure_column(&self.conn, "approvals", "archive_reason", "TEXT")?;
        ensure_column(&self.conn, "checkpoints", "archived_at", "TEXT")?;
        ensure_column(&self.conn, "checkpoints", "archive_reason", "TEXT")?;
        // F18 (RC-E): task ownership. Nullable + no backfill — existing rows stay
        // `NULL` (treated as un-owned, so reconcile leaves them alone), and only
        // tasks the daemon explicitly marks `daemon` are reset on restart.
        ensure_column(&self.conn, "tasks", "owner_kind", "TEXT")?;
        // Pairing-token TTL. When the column is first added to an existing DB,
        // backfill live tokens with a 30-day grace window from now rather than
        // expiring them instantly on upgrade. Fresh DBs already have the column
        // (so no backfill) and only tokens minted with `--ttl-days 0` keep a
        // NULL (never-expires) value going forward.
        if ensure_column(&self.conn, "pairing_tokens", "expires_at", "TEXT")? {
            let grace = (chrono::Utc::now() + chrono::Duration::days(30)).to_rfc3339();
            self.conn.execute(
                "UPDATE pairing_tokens SET expires_at = ?1 WHERE expires_at IS NULL",
                params![grace],
            )?;
        }

        // F76: structured per-version migration dispatch. Everything above is the
        // idempotent ADDITIVE baseline (`CREATE ... IF NOT EXISTS` + `ensure_column`),
        // always safe to re-run. This loop is the home for FUTURE NON-ADDITIVE
        // steps — dropping/renaming/transforming a column, rebuilding a table —
        // that the baseline cannot express: each target version's step runs once,
        // only when upgrading PAST it, inside this same transaction. Today every
        // shipped step is additive, so the arms are documented (near-)no-ops, but a
        // future v4 now has an ordered, versioned place to live instead of
        // overloading `IF NOT EXISTS`.
        for target in (from_version + 1)..=SCHEMA_VERSION {
            match target {
                // v2 added `tasks.owner_kind` — additive, applied by the baseline.
                2 => {},
                // v3: F75 covering indexes — additive, created by the baseline
                // above; this call is the concrete template for the first real
                // non-additive change.
                3 => self.migrate_to_v3()?,
                // A future v4+ adds its non-additive step here.
                _ => {},
            }
        }
        Ok(())
    }

    /// Non-additive migration steps introduced at schema v3. Today v3 only adds
    /// covering indexes (additive — applied by the idempotent baseline in
    /// [`Self::migrate_within_txn`]), so this is intentionally a no-op. It exists
    /// as the concrete template for the first real non-additive change: a step
    /// that, for example, drops or transforms a column, which
    /// `CREATE ... IF NOT EXISTS` and `ensure_column` cannot express. Runs inside
    /// the `init_schema` transaction, exactly once, when a DB upgrades past v2.
    fn migrate_to_v3(&self) -> Result<()> {
        Ok(())
    }
}

pub struct TasksRepo<'a> {
    conn: &'a Connection,
}

pub struct SessionsRepo<'a> {
    conn: &'a Connection,
}

impl SessionsRepo<'_> {
    pub fn upsert(&self, new: NewSession) -> Result<SessionRecord> {
        let now = now_rfc3339();
        let id = new.id.unwrap_or_else(|| fresh_id("session"));
        self.conn.execute(
            "INSERT INTO sessions
             (id, project_path, model_id, title, conversation_path, created_at, updated_at, total_tokens)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)
             ON CONFLICT(id) DO UPDATE SET
                project_path = excluded.project_path,
                model_id = excluded.model_id,
                title = excluded.title,
                conversation_path = excluded.conversation_path,
                updated_at = excluded.updated_at,
                total_tokens = excluded.total_tokens",
            params![
                id,
                new.project_path,
                new.model_id,
                new.title,
                new.conversation_path,
                now,
                now,
                new.total_tokens,
            ],
        )?;
        self.get(&id)?
            .context("session was upserted but could not be reloaded")
    }

    pub fn get(&self, id: &str) -> Result<Option<SessionRecord>> {
        self.conn
            .query_row(
                "SELECT id, project_path, model_id, title, conversation_path,
                        created_at, updated_at, total_tokens
                 FROM sessions WHERE id = ?1",
                [id],
                session_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn list(&self, limit: usize) -> Result<Vec<SessionRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, project_path, model_id, title, conversation_path,
                    created_at, updated_at, total_tokens
             FROM sessions ORDER BY updated_at DESC LIMIT ?1",
        )?;
        let rows = stmt.query_map([clamp_limit(limit)], session_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }
}

pub struct MessagesRepo<'a> {
    conn: &'a Connection,
}

impl MessagesRepo<'_> {
    pub fn add(&self, new: NewMessage) -> Result<MessageRecord> {
        self.conn.execute(
            "INSERT INTO messages (session_id, role, content_json, created_at)
             VALUES (?1, ?2, ?3, ?4)",
            params![new.session_id, new.role, new.content_json, now_rfc3339()],
        )?;
        let id = self.conn.last_insert_rowid();
        self.get(id)?
            .context("message was inserted but could not be reloaded")
    }

    pub fn get(&self, id: i64) -> Result<Option<MessageRecord>> {
        self.conn
            .query_row(
                "SELECT id, session_id, role, content_json, created_at
                 FROM messages WHERE id = ?1",
                [id],
                message_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    /// Load a session's messages in chronological order, capped at
    /// [`MAX_SESSION_MESSAGES`] (F24/RC-F).
    ///
    /// A session transcript is otherwise unbounded, and the daemon
    /// `session_messages` path loads it whole into RAM — a pathological session
    /// could OOM the daemon. We return the **most recent** `MAX_SESSION_MESSAGES`
    /// (newest activity is what a viewer wants) but still in ascending `id`
    /// order, by taking the tail in a subquery and re-sorting it ascending.
    pub fn list_for_session(&self, session_id: &str) -> Result<Vec<MessageRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, session_id, role, content_json, created_at FROM (
                 SELECT id, session_id, role, content_json, created_at
                 FROM messages WHERE session_id = ?1
                 ORDER BY id DESC LIMIT ?2
             ) ORDER BY id ASC",
        )?;
        let rows = stmt.query_map(params![session_id, MAX_SESSION_MESSAGES], message_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }
}

impl TasksRepo<'_> {
    pub fn create(&self, new: NewTask) -> Result<TaskRecord> {
        let now = now_rfc3339();
        // Owner tag isn't part of the public `TaskRecord`; move it out before the
        // record consumes the rest of `new`, then persist it on its own column.
        let owner_kind = new.owner_kind;
        let record = TaskRecord {
            id: fresh_id("task"),
            title: new.title,
            status: TaskStatus::Queued,
            priority: new.priority,
            project_path: new.project_path,
            model_id: new.model_id,
            conversation_id: new.conversation_id,
            created_at: now.clone(),
            updated_at: now.clone(),
            final_report: None,
        };
        // The task row and its initial event are one logical write — commit
        // them atomically so a crash between can't leave an event-less task.
        let tx = self.conn.unchecked_transaction()?;
        tx.execute(
            "INSERT INTO tasks
             (id, title, status, priority, project_path, model_id, conversation_id, created_at, updated_at, final_report, owner_kind)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11)",
            params![
                record.id,
                record.title,
                record.status.as_str(),
                record.priority.as_str(),
                record.project_path,
                record.model_id,
                record.conversation_id,
                record.created_at,
                record.updated_at,
                record.final_report,
                owner_kind,
            ],
        )?;
        tx.execute(
            "INSERT INTO task_events (task_id, kind, message, created_at)
             VALUES (?1, ?2, ?3, ?4)",
            params![record.id, "task_created", "task created", now],
        )?;
        tx.commit()?;
        self.get(&record.id)?
            .context("task was inserted but could not be reloaded")
    }

    pub fn get(&self, id: &str) -> Result<Option<TaskRecord>> {
        self.conn
            .query_row(
                "SELECT id, title, status, priority, project_path, model_id, conversation_id,
                        created_at, updated_at, final_report
                 FROM tasks WHERE id = ?1",
                [id],
                task_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn list(&self, limit: usize) -> Result<Vec<TaskRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, title, status, priority, project_path, model_id, conversation_id,
                    created_at, updated_at, final_report
             FROM tasks
             ORDER BY updated_at DESC
             LIMIT ?1",
        )?;
        // F19 (RC-E): skip-and-warn a single undecodable row (e.g. a status enum
        // a different binary wrote) instead of `collect`ing a `Result` that would
        // blank the WHOLE tasks panel on one poison row.
        let rows = stmt.query_map([clamp_limit(limit)], task_from_row_opt)?;
        collect_tolerant(rows)
    }

    pub fn update_status(
        &self,
        id: &str,
        status: TaskStatus,
        final_report: Option<&str>,
    ) -> Result<()> {
        let now = now_rfc3339();
        // Status update + its event are one logical write.
        let tx = self.conn.unchecked_transaction()?;
        tx.execute(
            "UPDATE tasks
             SET status = ?2, updated_at = ?3, final_report = COALESCE(?4, final_report)
             WHERE id = ?1",
            params![id, status.as_str(), now, final_report],
        )?;
        tx.execute(
            "INSERT INTO task_events (task_id, kind, message, created_at)
             VALUES (?1, ?2, ?3, ?4)",
            params![
                id,
                "status_changed",
                format!("status changed to {status}"),
                now
            ],
        )?;
        tx.commit()?;
        Ok(())
    }

    pub fn add_event(&self, task_id: &str, kind: &str, message: &str) -> Result<()> {
        self.conn.execute(
            "INSERT INTO task_events (task_id, kind, message, created_at)
             VALUES (?1, ?2, ?3, ?4)",
            params![task_id, kind, message, now_rfc3339()],
        )?;
        Ok(())
    }

    pub fn events(&self, task_id: &str) -> Result<Vec<TaskTimelineEvent>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, task_id, kind, message, created_at
             FROM task_events
             WHERE task_id = ?1
             ORDER BY id ASC",
        )?;
        // F19 (RC-E): one undecodable event row must not blank the whole timeline.
        let rows = stmt.query_map([task_id], task_event_from_row_opt)?;
        collect_tolerant(rows)
    }
}

pub struct ToolRunsRepo<'a> {
    conn: &'a Connection,
}

impl ToolRunsRepo<'_> {
    pub fn start(&self, new: NewToolRun) -> Result<ToolRunRecord> {
        let id = new.id.unwrap_or_else(|| fresh_id("toolrun"));
        self.conn.execute(
            "INSERT INTO tool_runs
             (id, task_id, turn_id, call_id, tool_name, status, args_json, output_json, started_at, finished_at)
             VALUES (?1, ?2, ?3, ?4, ?5, 'running', ?6, NULL, ?7, NULL)",
            params![
                id,
                new.task_id,
                new.turn_id,
                new.call_id,
                new.tool_name,
                new.args_json,
                now_rfc3339(),
            ],
        )?;
        self.get(&id)?
            .context("tool run was inserted but could not be reloaded")
    }

    pub fn finish(&self, id: &str, status: &str, output_json: Option<&str>) -> Result<()> {
        let changed = self.conn.execute(
            "UPDATE tool_runs
             SET status = ?2, output_json = ?3, finished_at = ?4
             WHERE id = ?1",
            params![id, status, output_json, now_rfc3339()],
        )?;
        anyhow::ensure!(changed > 0, "tool run not found: {}", id);
        Ok(())
    }

    pub fn get(&self, id: &str) -> Result<Option<ToolRunRecord>> {
        self.conn
            .query_row(
                "SELECT id, task_id, turn_id, call_id, tool_name, status, args_json,
                        output_json, started_at, finished_at
                 FROM tool_runs WHERE id = ?1",
                [id],
                tool_run_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn list(&self, limit: usize) -> Result<Vec<ToolRunRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, task_id, turn_id, call_id, tool_name, status, args_json,
                    output_json, started_at, finished_at
             FROM tool_runs ORDER BY started_at DESC LIMIT ?1",
        )?;
        let rows = stmt.query_map([clamp_limit(limit)], tool_run_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }
}

pub struct ApprovalsRepo<'a> {
    conn: &'a Connection,
}

impl ApprovalsRepo<'_> {
    pub fn create(&self, new: NewApproval) -> Result<ApprovalRecord> {
        let record = ApprovalRecord {
            id: fresh_id("approval"),
            task_id: new.task_id,
            proposed_action: new.proposed_action,
            risk_classification: new.risk_classification,
            policy_decision: new.policy_decision,
            user_decision: None,
            args_summary: new.args_summary,
            checkpoint_id: new.checkpoint_id,
            pending_action_json: new.pending_action_json,
            created_at: now_rfc3339(),
            decided_at: None,
            archived_at: None,
            archive_reason: None,
        };
        self.conn.execute(
            "INSERT INTO approvals
             (id, task_id, proposed_action, risk_classification, policy_decision, user_decision,
              args_summary, checkpoint_id, pending_action_json, created_at, decided_at)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11)",
            params![
                record.id,
                record.task_id,
                record.proposed_action,
                record.risk_classification,
                record.policy_decision,
                record.user_decision,
                record.args_summary,
                record.checkpoint_id,
                record.pending_action_json,
                record.created_at,
                record.decided_at,
            ],
        )?;
        self.get(&record.id)?
            .context("approval was inserted but could not be reloaded")
    }

    pub fn get(&self, id: &str) -> Result<Option<ApprovalRecord>> {
        self.conn
            .query_row(
                "SELECT id, task_id, proposed_action, risk_classification, policy_decision,
                        user_decision, args_summary, checkpoint_id, pending_action_json,
                        created_at, decided_at, archived_at, archive_reason
                 FROM approvals WHERE id = ?1",
                [id],
                approval_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn decide(&self, id: &str, user_decision: &str) -> Result<()> {
        // Single-shot decision: only an undecided, un-archived approval can be
        // decided, so a denied approval cannot be resurrected as "approved".
        // `approval::approve_and_replay` runs the (un-rollback-able) replay
        // effect *before* calling `decide`, so the "approved" mark lands only
        // after the action ran: a crash mid-replay leaves the row undecided and
        // safely re-runnable, never "approved but never applied" (#62). Mirrors
        // the `archive` `WHERE archived_at IS NULL` idempotency pattern below.
        let changed = self.conn.execute(
            "UPDATE approvals
             SET user_decision = ?2, decided_at = ?3
             WHERE id = ?1 AND user_decision IS NULL AND archived_at IS NULL",
            params![id, user_decision, now_rfc3339()],
        )?;
        anyhow::ensure!(
            changed > 0,
            "approval {} cannot be decided (already decided, archived, or not found)",
            id
        );
        Ok(())
    }

    /// Atomically claim an undecided approval for replay (#118). Sets
    /// `user_decision='approving'` only when it is currently NULL and
    /// un-archived, and reports whether THIS caller won the claim. Two concurrent
    /// `approve <id>` calls race this single UPDATE; exactly one sees
    /// `rows_affected == 1` and runs the un-rollback-able effect, the other sees
    /// `false` and bails — so the effect can't fire twice. A claim that crashes
    /// before finalizing is reset to NULL by the daemon's startup reconcile.
    pub fn claim(&self, id: &str) -> Result<bool> {
        let changed = self.conn.execute(
            "UPDATE approvals
             SET user_decision = 'approving'
             WHERE id = ?1 AND user_decision IS NULL AND archived_at IS NULL",
            params![id],
        )?;
        Ok(changed == 1)
    }

    /// Release a claim taken by [`Self::claim`] back to undecided, so the action
    /// stays re-runnable after the replay effect failed.
    pub fn release_claim(&self, id: &str) -> Result<()> {
        self.conn.execute(
            "UPDATE approvals SET user_decision = NULL
             WHERE id = ?1 AND user_decision = 'approving'",
            params![id],
        )?;
        Ok(())
    }

    /// Finalize a claimed approval's decision (the `approving` → terminal-value
    /// transition that [`Self::decide`]'s `WHERE user_decision IS NULL` can't make).
    pub fn finalize_claimed(&self, id: &str, user_decision: &str) -> Result<()> {
        let changed = self.conn.execute(
            "UPDATE approvals
             SET user_decision = ?2, decided_at = ?3
             WHERE id = ?1 AND user_decision = 'approving'",
            params![id, user_decision, now_rfc3339()],
        )?;
        anyhow::ensure!(changed > 0, "approval {} was not in the claimed state", id);
        Ok(())
    }

    pub fn list_pending(&self) -> Result<Vec<ApprovalRecord>> {
        self.list_pending_with_archived(false)
    }

    pub fn list_pending_all(&self) -> Result<Vec<ApprovalRecord>> {
        self.list_pending_with_archived(true)
    }

    pub fn list_all(&self, limit: usize) -> Result<Vec<ApprovalRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, task_id, proposed_action, risk_classification, policy_decision,
                    user_decision, args_summary, checkpoint_id, pending_action_json,
                    created_at, decided_at, archived_at, archive_reason
             FROM approvals
             ORDER BY created_at DESC
             LIMIT ?1",
        )?;
        let rows = stmt.query_map([clamp_limit(limit)], approval_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }

    fn list_pending_with_archived(&self, include_archived: bool) -> Result<Vec<ApprovalRecord>> {
        let archived_filter = if include_archived {
            ""
        } else {
            " AND archived_at IS NULL"
        };
        let mut stmt = self.conn.prepare(&format!(
            "SELECT id, task_id, proposed_action, risk_classification, policy_decision,
                    user_decision, args_summary, checkpoint_id, pending_action_json,
                    created_at, decided_at, archived_at, archive_reason
             FROM approvals
             WHERE user_decision IS NULL{archived_filter}
             ORDER BY created_at DESC"
        ))?;
        let rows = stmt.query_map([], approval_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }

    pub fn archive(&self, ids: &[String], reason: &str) -> Result<usize> {
        let archived_at = now_rfc3339();
        let mut changed = 0;
        for id in ids {
            changed += self.conn.execute(
                "UPDATE approvals
                 SET archived_at = COALESCE(archived_at, ?2),
                     archive_reason = COALESCE(archive_reason, ?3)
                 WHERE id = ?1 AND archived_at IS NULL",
                params![id, archived_at, reason],
            )?;
        }
        Ok(changed)
    }

    pub fn count_archived(&self) -> Result<usize> {
        self.conn
            .query_row(
                "SELECT COUNT(*) FROM approvals WHERE archived_at IS NOT NULL",
                [],
                |row| row.get::<_, i64>(0),
            )
            .map(|count| count as usize)
            .map_err(Into::into)
    }
}

pub struct ProcessesRepo<'a> {
    conn: &'a Connection,
}

impl ProcessesRepo<'_> {
    pub fn upsert(&self, new: NewProcess) -> Result<ProcessRecord> {
        let now = now_rfc3339();
        let id = new.id.unwrap_or_else(|| fresh_id("process"));
        self.conn.execute(
            "INSERT INTO processes
             (id, task_id, pid, command, cwd, log_path, detected_url, status, health, created_at, updated_at)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11)
             ON CONFLICT(id) DO UPDATE SET
                task_id = excluded.task_id,
                pid = excluded.pid,
                command = excluded.command,
                cwd = excluded.cwd,
                log_path = excluded.log_path,
                detected_url = excluded.detected_url,
                status = excluded.status,
                health = excluded.health,
                updated_at = excluded.updated_at",
            params![
                id,
                new.task_id,
                new.pid,
                new.command,
                new.cwd,
                new.log_path,
                new.detected_url,
                new.status.as_str(),
                new.health,
                now,
                now,
            ],
        )?;
        self.get(&id)?
            .context("process was upserted but could not be reloaded")
    }

    pub fn get(&self, id: &str) -> Result<Option<ProcessRecord>> {
        self.conn
            .query_row(
                "SELECT id, task_id, pid, command, cwd, log_path, detected_url, status, health,
                        created_at, updated_at
                 FROM processes WHERE id = ?1",
                [id],
                process_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn list(&self, limit: usize) -> Result<Vec<ProcessRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, task_id, pid, command, cwd, log_path, detected_url, status, health,
                    created_at, updated_at
             FROM processes
             ORDER BY updated_at DESC
             LIMIT ?1",
        )?;
        // F19 (RC-E): skip-and-warn an undecodable row (e.g. a status enum a
        // different binary wrote) rather than blanking the whole processes panel.
        let rows = stmt.query_map([clamp_limit(limit)], process_from_row_opt)?;
        collect_tolerant(rows)
    }
}

pub struct CheckpointsRepo<'a> {
    conn: &'a Connection,
}

impl CheckpointsRepo<'_> {
    pub fn create(&self, new: NewCheckpoint) -> Result<CheckpointRecord> {
        let id = new.id.unwrap_or_else(|| fresh_id("checkpoint"));
        self.conn.execute(
            "INSERT INTO checkpoints
             (id, task_id, project_path, snapshot_path, changed_files_json,
              pending_action_json, approval_id, created_at)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)",
            params![
                id,
                new.task_id,
                new.project_path,
                new.snapshot_path,
                new.changed_files_json,
                new.pending_action_json,
                new.approval_id,
                now_rfc3339(),
            ],
        )?;
        self.get(&id)?
            .context("checkpoint was inserted but could not be reloaded")
    }

    pub fn get(&self, id: &str) -> Result<Option<CheckpointRecord>> {
        self.conn
            .query_row(
                "SELECT id, task_id, project_path, snapshot_path, changed_files_json,
                        pending_action_json, approval_id, created_at, archived_at, archive_reason
                 FROM checkpoints WHERE id = ?1",
                [id],
                checkpoint_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn set_approval(&self, id: &str, approval_id: &str) -> Result<()> {
        let changed = self.conn.execute(
            "UPDATE checkpoints SET approval_id = ?2 WHERE id = ?1",
            params![id, approval_id],
        )?;
        anyhow::ensure!(changed > 0, "checkpoint not found: {}", id);
        Ok(())
    }

    /// Delete a checkpoint row outright. Returns whether a row was removed.
    ///
    /// F23 (RC-F): coordinates the on-disk checkpoint-dir GC
    /// ([`crate::checkpoint::gc_old_checkpoint_dirs`]) with the DB. The dir GC
    /// prunes by mtime regardless of archive state, while storage [`Self`] /
    /// `gc()` only removes ARCHIVED checkpoint rows — so a never-archived old
    /// checkpoint would lose its directory while its row survived, and a later
    /// `restore_checkpoint` would fail on the missing manifest. The dir GC now
    /// calls this so `list()` and the on-disk dirs stay in agreement.
    pub fn delete(&self, id: &str) -> Result<bool> {
        let changed = self
            .conn
            .execute("DELETE FROM checkpoints WHERE id = ?1", params![id])?;
        Ok(changed > 0)
    }

    pub fn list(&self, limit: usize) -> Result<Vec<CheckpointRecord>> {
        self.list_with_archived(limit, false)
    }

    pub fn list_all(&self, limit: usize) -> Result<Vec<CheckpointRecord>> {
        self.list_with_archived(limit, true)
    }

    fn list_with_archived(
        &self,
        limit: usize,
        include_archived: bool,
    ) -> Result<Vec<CheckpointRecord>> {
        let archived_filter = if include_archived {
            ""
        } else {
            "WHERE archived_at IS NULL"
        };
        let mut stmt = self.conn.prepare(&format!(
            "SELECT id, task_id, project_path, snapshot_path, changed_files_json,
                    pending_action_json, approval_id, created_at, archived_at, archive_reason
             FROM checkpoints {archived_filter} ORDER BY created_at DESC LIMIT ?1"
        ))?;
        let rows = stmt.query_map([clamp_limit(limit)], checkpoint_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }

    pub fn archive(&self, ids: &[String], reason: &str) -> Result<usize> {
        let archived_at = now_rfc3339();
        let mut changed = 0;
        for id in ids {
            changed += self.conn.execute(
                "UPDATE checkpoints
                 SET archived_at = COALESCE(archived_at, ?2),
                     archive_reason = COALESCE(archive_reason, ?3)
                 WHERE id = ?1 AND archived_at IS NULL",
                params![id, archived_at, reason],
            )?;
        }
        Ok(changed)
    }

    pub fn count_archived(&self) -> Result<usize> {
        self.conn
            .query_row(
                "SELECT COUNT(*) FROM checkpoints WHERE archived_at IS NOT NULL",
                [],
                |row| row.get::<_, i64>(0),
            )
            .map(|count| count as usize)
            .map_err(Into::into)
    }
}

pub struct CompactionsRepo<'a> {
    conn: &'a Connection,
}

impl CompactionsRepo<'_> {
    pub fn create(&self, new: NewCompaction) -> Result<CompactionRecord> {
        let id = new.id.unwrap_or_else(|| fresh_id("compaction"));
        self.conn.execute(
            "INSERT INTO compactions
             (id, task_id, session_id, source_token_estimate, summary_token_count,
              preserved_turns, archive_path, verification_status, created_at)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9)
             ON CONFLICT(id) DO UPDATE SET
                task_id = excluded.task_id,
                session_id = excluded.session_id,
                source_token_estimate = excluded.source_token_estimate,
                summary_token_count = excluded.summary_token_count,
                preserved_turns = excluded.preserved_turns,
                archive_path = excluded.archive_path,
                verification_status = excluded.verification_status",
            params![
                id,
                new.task_id,
                new.session_id,
                new.source_token_estimate,
                new.summary_token_count,
                new.preserved_turns,
                new.archive_path,
                new.verification_status,
                now_rfc3339(),
            ],
        )?;
        self.get(&id)?
            .context("compaction was inserted but could not be reloaded")
    }

    pub fn get(&self, id: &str) -> Result<Option<CompactionRecord>> {
        self.conn
            .query_row(
                "SELECT id, task_id, session_id, source_token_estimate, summary_token_count,
                        preserved_turns, archive_path, verification_status, created_at
                 FROM compactions WHERE id = ?1",
                [id],
                compaction_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn list(&self, limit: usize) -> Result<Vec<CompactionRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, task_id, session_id, source_token_estimate, summary_token_count,
                    preserved_turns, archive_path, verification_status, created_at
             FROM compactions ORDER BY created_at DESC LIMIT ?1",
        )?;
        let rows = stmt.query_map([clamp_limit(limit)], compaction_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }
}

pub struct PluginsRepo<'a> {
    conn: &'a Connection,
}

impl PluginsRepo<'_> {
    pub fn install(&self, new: NewPluginInstall) -> Result<PluginInstallRecord> {
        let now = now_rfc3339();
        let id = new.id.unwrap_or_else(|| fresh_id("plugin"));
        self.conn.execute(
            "INSERT INTO plugin_installs
             (id, name, source, version, enabled, manifest_json, installed_at, updated_at)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)
             ON CONFLICT(id) DO UPDATE SET
                name = excluded.name,
                source = excluded.source,
                version = excluded.version,
                enabled = excluded.enabled,
                manifest_json = excluded.manifest_json,
                updated_at = excluded.updated_at",
            params![
                id,
                new.name,
                new.source,
                new.version,
                if new.enabled { 1 } else { 0 },
                new.manifest_json,
                now,
                now,
            ],
        )?;
        self.get(&id)?
            .context("plugin install was inserted but could not be reloaded")
    }

    pub fn get(&self, id: &str) -> Result<Option<PluginInstallRecord>> {
        self.conn
            .query_row(
                "SELECT id, name, source, version, enabled, manifest_json, installed_at, updated_at
                 FROM plugin_installs WHERE id = ?1",
                [id],
                plugin_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn list(&self) -> Result<Vec<PluginInstallRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, name, source, version, enabled, manifest_json, installed_at, updated_at
             FROM plugin_installs ORDER BY name ASC",
        )?;
        let rows = stmt.query_map([], plugin_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }

    pub fn set_enabled(&self, id: &str, enabled: bool) -> Result<()> {
        self.conn.execute(
            "UPDATE plugin_installs SET enabled = ?2, updated_at = ?3 WHERE id = ?1",
            params![id, if enabled { 1 } else { 0 }, now_rfc3339()],
        )?;
        Ok(())
    }
}

pub struct ProviderProbesRepo<'a> {
    conn: &'a Connection,
}

impl ProviderProbesRepo<'_> {
    pub fn upsert(&self, new: NewProviderProbe) -> Result<ProviderProbeRecord> {
        let now = now_rfc3339();
        let provider = new.provider;
        let model_id = new.model_id;
        let capability_key = new.capability_key;
        self.conn.execute(
            "INSERT INTO provider_probes
             (provider, model_id, capability_key, capability_value, confidence, error, probed_at)
             VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7)
             ON CONFLICT(provider, model_id, capability_key) DO UPDATE SET
                capability_value = excluded.capability_value,
                confidence = excluded.confidence,
                error = excluded.error,
                probed_at = excluded.probed_at",
            params![
                &provider,
                &model_id,
                &capability_key,
                new.capability_value,
                new.confidence,
                new.error,
                now,
            ],
        )?;
        self.get(&provider, &model_id, &capability_key)?
            .context("provider probe was inserted but could not be reloaded")
    }

    pub fn get(
        &self,
        provider: &str,
        model_id: &str,
        capability_key: &str,
    ) -> Result<Option<ProviderProbeRecord>> {
        self.conn
            .query_row(
                "SELECT provider, model_id, capability_key, capability_value, confidence, error, probed_at
                 FROM provider_probes
                 WHERE provider = ?1 AND model_id = ?2 AND capability_key = ?3",
                params![provider, model_id, capability_key],
                provider_probe_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    pub fn list(
        &self,
        provider: Option<&str>,
        model_id: Option<&str>,
    ) -> Result<Vec<ProviderProbeRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT provider, model_id, capability_key, capability_value, confidence, error, probed_at
             FROM provider_probes ORDER BY provider ASC, model_id ASC, capability_key ASC",
        )?;
        let rows = stmt.query_map([], provider_probe_from_row)?;
        let mut out = Vec::new();
        for row in rows {
            let probe = row?;
            if provider.is_some_and(|p| probe.provider != p) {
                continue;
            }
            if model_id.is_some_and(|m| probe.model_id != m) {
                continue;
            }
            out.push(probe);
        }
        Ok(out)
    }
}

pub struct PairingTokensRepo<'a> {
    conn: &'a Connection,
}

impl PairingTokensRepo<'_> {
    pub fn create(
        &self,
        token_hash: &str,
        label: Option<&str>,
        expires_at: Option<&str>,
    ) -> Result<PairingTokenRecord> {
        let id = fresh_id("pairing");
        self.conn.execute(
            "INSERT INTO pairing_tokens
                 (id, token_hash, label, enabled, created_at, last_used_at, expires_at)
             VALUES (?1, ?2, ?3, 1, ?4, NULL, ?5)",
            params![id, token_hash, label, now_rfc3339(), expires_at],
        )?;
        self.get(&id)?
            .context("pairing token was inserted but could not be reloaded")
    }

    pub fn get(&self, id: &str) -> Result<Option<PairingTokenRecord>> {
        self.conn
            .query_row(
                "SELECT id, token_hash, label, enabled, created_at, last_used_at, expires_at
                 FROM pairing_tokens WHERE id = ?1",
                [id],
                pairing_from_row,
            )
            .optional()
            .map_err(Into::into)
    }

    /// Look up an enabled, unexpired pairing token by hash.
    ///
    /// The hash is **not** matched in SQL (`WHERE token_hash = ?`) — that is a
    /// DB-level equality on the secret and a theoretical timing channel.
    /// Instead we fetch the enabled, unexpired candidates (neither predicate is
    /// secret) and compare each hash in constant time. The candidate count is
    /// tiny and not secret. All candidates are scanned without early exit so the
    /// timing doesn't reveal which (if any) token matched.
    pub fn verify_token(&self, token_hash: &str) -> Result<Option<PairingTokenRecord>> {
        // Expiry is evaluated in Rust as a parsed instant (see `is_expired`),
        // not via a SQL `expires_at > ?` string compare. The skipped-because-
        // expired branch is on non-secret data; the hash itself is still matched
        // in constant time over every non-expired candidate with no early exit.
        let now = chrono::Utc::now();
        let mut stmt = self.conn.prepare(
            "SELECT id, token_hash, label, enabled, created_at, last_used_at, expires_at
             FROM pairing_tokens
             WHERE enabled = 1",
        )?;
        let candidates = stmt
            .query_map([], pairing_from_row)?
            .collect::<rusqlite::Result<Vec<_>>>()?;
        let mut found = None;
        for record in candidates {
            if is_expired(record.expires_at.as_deref(), now) {
                continue;
            }
            if ct_eq(record.token_hash.as_bytes(), token_hash.as_bytes()) {
                found = Some(record);
            }
        }
        Ok(found)
    }

    pub fn list(&self) -> Result<Vec<PairingTokenRecord>> {
        let mut stmt = self.conn.prepare(
            "SELECT id, token_hash, label, enabled, created_at, last_used_at, expires_at
             FROM pairing_tokens ORDER BY created_at DESC",
        )?;
        let rows = stmt.query_map([], pairing_from_row)?;
        rows.collect::<rusqlite::Result<Vec<_>>>()
            .map_err(Into::into)
    }

    /// Like [`list`](Self::list), but with `token_hash` blanked. Use for any
    /// surface that crosses a trust boundary — e.g. the daemon snapshot served
    /// over the local socket to same-UID processes. The hash is
    /// secret-equivalent (it's all `verify_token` compares against) and must
    /// not leave the store.
    pub fn list_redacted(&self) -> Result<Vec<PairingTokenRecord>> {
        Ok(self
            .list()?
            .into_iter()
            .map(|mut record| {
                record.token_hash = String::new();
                record
            })
            .collect())
    }

    pub fn mark_used(&self, id: &str) -> Result<()> {
        self.conn.execute(
            "UPDATE pairing_tokens SET last_used_at = ?2 WHERE id = ?1 AND enabled = 1",
            params![id, now_rfc3339()],
        )?;
        Ok(())
    }

    /// Revoke a token by disabling it. Returns `true` if a live token was
    /// revoked, `false` if it was already disabled or unknown.
    pub fn revoke(&self, id: &str) -> Result<bool> {
        let changed = self.conn.execute(
            "UPDATE pairing_tokens SET enabled = 0 WHERE id = ?1 AND enabled = 1",
            params![id],
        )?;
        Ok(changed > 0)
    }
}

/// Add `column` to `table` if it is missing. Returns `true` iff the column was
/// just created (so the caller can run a one-time backfill).
///
/// SQL identifiers cannot be bound as `?` parameters, so `table`/`column`/
/// `definition` are interpolated. All call sites pass compile-time constants
/// today; the validation below makes that a hard invariant rather than a latent
/// injection footgun if a future caller ever threads in dynamic input.
fn ensure_column(conn: &Connection, table: &str, column: &str, definition: &str) -> Result<bool> {
    fn is_sql_identifier(s: &str) -> bool {
        let mut chars = s.chars();
        matches!(chars.next(), Some(c) if c.is_ascii_alphabetic() || c == '_')
            && s.chars().all(|c| c.is_ascii_alphanumeric() || c == '_')
    }
    const ALLOWED_DEFINITIONS: &[&str] = &["TEXT", "INTEGER", "REAL", "BLOB"];
    anyhow::ensure!(
        is_sql_identifier(table),
        "invalid table identifier: {table}"
    );
    anyhow::ensure!(
        is_sql_identifier(column),
        "invalid column identifier: {column}"
    );
    anyhow::ensure!(
        ALLOWED_DEFINITIONS.contains(&definition),
        "unsupported column definition: {definition}"
    );

    let mut stmt = conn.prepare(&format!("PRAGMA table_info({table})"))?;
    let mut rows = stmt.query([])?;
    while let Some(row) = rows.next()? {
        let name: String = row.get(1)?;
        if name == column {
            return Ok(false);
        }
    }
    // Tolerate a concurrent opener that added the column between our
    // `table_info` check and this ALTER. SQLite reports that as a "duplicate
    // column name" schema error (not SQLITE_BUSY, so `busy_timeout` can't retry
    // it); treat it as already-present rather than failing the whole store open.
    match conn.execute(
        &format!("ALTER TABLE {table} ADD COLUMN {column} {definition}"),
        [],
    ) {
        Ok(_) => Ok(true),
        Err(error) if error.to_string().contains("duplicate column") => Ok(false),
        Err(error) => Err(error.into()),
    }
}

pub fn data_dir() -> Result<PathBuf> {
    if let Some(proj_dirs) = ProjectDirs::from("", "", "mermaid") {
        return Ok(proj_dirs.data_dir().to_path_buf());
    }
    let home = std::env::var("HOME")
        .or_else(|_| std::env::var("USERPROFILE"))
        .context("could not determine home directory")?;
    Ok(PathBuf::from(home).join(".local/share/mermaid"))
}

fn session_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<SessionRecord> {
    Ok(SessionRecord {
        id: row.get("id")?,
        project_path: row.get("project_path")?,
        model_id: row.get("model_id")?,
        title: row.get("title")?,
        conversation_path: row.get("conversation_path")?,
        created_at: row.get("created_at")?,
        updated_at: row.get("updated_at")?,
        total_tokens: row.get("total_tokens")?,
    })
}

fn message_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<MessageRecord> {
    Ok(MessageRecord {
        id: row.get("id")?,
        session_id: row.get("session_id")?,
        role: row.get("role")?,
        content_json: row.get("content_json")?,
        created_at: row.get("created_at")?,
    })
}

fn task_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<TaskRecord> {
    let status_raw: String = row.get("status")?;
    let priority_raw: String = row.get("priority")?;
    Ok(TaskRecord {
        id: row.get("id")?,
        title: row.get("title")?,
        status: TaskStatus::from_db(&status_raw)
            .map_err(|e| enum_from_sql_error("status", status_raw, e))?,
        priority: TaskPriority::from_db(&priority_raw)
            .map_err(|e| enum_from_sql_error("priority", priority_raw, e))?,
        project_path: row.get("project_path")?,
        model_id: row.get("model_id")?,
        conversation_id: row.get("conversation_id")?,
        created_at: row.get("created_at")?,
        updated_at: row.get("updated_at")?,
        final_report: row.get("final_report")?,
    })
}

fn process_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<ProcessRecord> {
    let status_raw: String = row.get("status")?;
    let pid: i64 = row.get("pid")?;
    Ok(ProcessRecord {
        id: row.get("id")?,
        task_id: row.get("task_id")?,
        pid: pid as u32,
        command: row.get("command")?,
        cwd: row.get("cwd")?,
        log_path: row.get("log_path")?,
        detected_url: row.get("detected_url")?,
        status: ProcessStatus::from_db(&status_raw)
            .map_err(|e| enum_from_sql_error("status", status_raw, e))?,
        health: row.get("health")?,
        created_at: row.get("created_at")?,
        updated_at: row.get("updated_at")?,
    })
}

fn tool_run_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<ToolRunRecord> {
    Ok(ToolRunRecord {
        id: row.get("id")?,
        task_id: row.get("task_id")?,
        turn_id: row.get("turn_id")?,
        call_id: row.get("call_id")?,
        tool_name: row.get("tool_name")?,
        status: row.get("status")?,
        args_json: row.get("args_json")?,
        output_json: row.get("output_json")?,
        started_at: row.get("started_at")?,
        finished_at: row.get("finished_at")?,
    })
}

fn approval_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<ApprovalRecord> {
    Ok(ApprovalRecord {
        id: row.get("id")?,
        task_id: row.get("task_id")?,
        proposed_action: row.get("proposed_action")?,
        risk_classification: row.get("risk_classification")?,
        policy_decision: row.get("policy_decision")?,
        user_decision: row.get("user_decision")?,
        args_summary: row.get("args_summary")?,
        checkpoint_id: row.get("checkpoint_id")?,
        pending_action_json: row.get("pending_action_json")?,
        created_at: row.get("created_at")?,
        decided_at: row.get("decided_at")?,
        archived_at: row.get("archived_at")?,
        archive_reason: row.get("archive_reason")?,
    })
}

fn checkpoint_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<CheckpointRecord> {
    Ok(CheckpointRecord {
        id: row.get("id")?,
        task_id: row.get("task_id")?,
        project_path: row.get("project_path")?,
        snapshot_path: row.get("snapshot_path")?,
        changed_files_json: row.get("changed_files_json")?,
        pending_action_json: row.get("pending_action_json")?,
        approval_id: row.get("approval_id")?,
        created_at: row.get("created_at")?,
        archived_at: row.get("archived_at")?,
        archive_reason: row.get("archive_reason")?,
    })
}

fn compaction_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<CompactionRecord> {
    Ok(CompactionRecord {
        id: row.get("id")?,
        task_id: row.get("task_id")?,
        session_id: row.get("session_id")?,
        source_token_estimate: row.get("source_token_estimate")?,
        summary_token_count: row.get("summary_token_count")?,
        preserved_turns: row.get("preserved_turns")?,
        archive_path: row.get("archive_path")?,
        verification_status: row.get("verification_status")?,
        created_at: row.get("created_at")?,
    })
}

fn plugin_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<PluginInstallRecord> {
    let enabled: i64 = row.get("enabled")?;
    Ok(PluginInstallRecord {
        id: row.get("id")?,
        name: row.get("name")?,
        source: row.get("source")?,
        version: row.get("version")?,
        enabled: enabled != 0,
        manifest_json: row.get("manifest_json")?,
        installed_at: row.get("installed_at")?,
        updated_at: row.get("updated_at")?,
    })
}

fn provider_probe_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<ProviderProbeRecord> {
    Ok(ProviderProbeRecord {
        provider: row.get("provider")?,
        model_id: row.get("model_id")?,
        capability_key: row.get("capability_key")?,
        capability_value: row.get("capability_value")?,
        confidence: row.get("confidence")?,
        error: row.get("error")?,
        probed_at: row.get("probed_at")?,
    })
}

fn pairing_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<PairingTokenRecord> {
    let enabled: i64 = row.get("enabled")?;
    Ok(PairingTokenRecord {
        id: row.get("id")?,
        token_hash: row.get("token_hash")?,
        label: row.get("label")?,
        enabled: enabled != 0,
        created_at: row.get("created_at")?,
        last_used_at: row.get("last_used_at")?,
        expires_at: row.get("expires_at")?,
    })
}

fn task_event_from_row(row: &rusqlite::Row<'_>) -> rusqlite::Result<TaskTimelineEvent> {
    Ok(TaskTimelineEvent {
        id: row.get("id")?,
        task_id: row.get("task_id")?,
        kind: row.get("kind")?,
        message: row.get("message")?,
        created_at: row.get("created_at")?,
    })
}

/// Whether a row error is a per-row DECODE failure — a value a different binary
/// wrote that this build can't parse: an unknown enum
/// ([`rusqlite::Error::FromSqlConversionFailure`], how `task_from_row` /
/// `process_from_row` surface an unknown status) or a column type mismatch
/// ([`rusqlite::Error::InvalidColumnType`]). F19 (RC-E): the list/events paths
/// skip-and-warn on these so one poison row can't blank an entire panel, while a
/// genuine infrastructure error (a locked DB, a dropped column) still propagates.
fn is_row_decode_error(err: &rusqlite::Error) -> bool {
    matches!(
        err,
        rusqlite::Error::FromSqlConversionFailure(..) | rusqlite::Error::InvalidColumnType(..)
    )
}

/// Tolerant [`task_from_row`]: `Ok(None)` (with a warning) for a row this build
/// can't decode, so [`TasksRepo::list`] skips it instead of failing the list.
fn task_from_row_opt(row: &rusqlite::Row<'_>) -> rusqlite::Result<Option<TaskRecord>> {
    match task_from_row(row) {
        Ok(record) => Ok(Some(record)),
        Err(err) if is_row_decode_error(&err) => {
            tracing::warn!(error = %err, "skipping task row this build can't decode (version skew?)");
            Ok(None)
        },
        Err(err) => Err(err),
    }
}

/// Tolerant [`process_from_row`] — see [`task_from_row_opt`].
fn process_from_row_opt(row: &rusqlite::Row<'_>) -> rusqlite::Result<Option<ProcessRecord>> {
    match process_from_row(row) {
        Ok(record) => Ok(Some(record)),
        Err(err) if is_row_decode_error(&err) => {
            tracing::warn!(error = %err, "skipping process row this build can't decode (version skew?)");
            Ok(None)
        },
        Err(err) => Err(err),
    }
}

/// Tolerant [`task_event_from_row`] — see [`task_from_row_opt`].
fn task_event_from_row_opt(row: &rusqlite::Row<'_>) -> rusqlite::Result<Option<TaskTimelineEvent>> {
    match task_event_from_row(row) {
        Ok(record) => Ok(Some(record)),
        Err(err) if is_row_decode_error(&err) => {
            tracing::warn!(error = %err, "skipping task event row this build can't decode");
            Ok(None)
        },
        Err(err) => Err(err),
    }
}

/// Collect rows from a tolerant decoder (one that yields `Ok(None)` for a
/// skipped poison row), dropping the `None`s and propagating any real error.
fn collect_tolerant<T>(rows: impl Iterator<Item = rusqlite::Result<Option<T>>>) -> Result<Vec<T>> {
    let mut out = Vec::new();
    for row in rows {
        if let Some(item) = row? {
            out.push(item);
        }
    }
    Ok(out)
}

fn enum_from_sql_error(
    column: &'static str,
    value: String,
    source: UnknownRuntimeEnum,
) -> rusqlite::Error {
    let _ = value;
    rusqlite::Error::FromSqlConversionFailure(column_index(column), Type::Text, Box::new(source))
}

fn column_index(column: &str) -> usize {
    match column {
        "status" => 2,
        "priority" => 3,
        _ => 0,
    }
}

#[derive(Debug)]
struct UnknownRuntimeEnum {
    kind: &'static str,
    value: String,
}

impl UnknownRuntimeEnum {
    fn new(kind: &'static str, value: &str) -> Self {
        Self {
            kind,
            value: value.to_string(),
        }
    }
}

impl fmt::Display for UnknownRuntimeEnum {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "unknown {} value `{}`", self.kind, self.value)
    }
}

impl std::error::Error for UnknownRuntimeEnum {}

fn now_rfc3339() -> String {
    chrono::Utc::now().to_rfc3339()
}

/// Constant-time byte-slice equality. Unlike `==` (or a SQL `=`), it never
/// short-circuits on the first differing byte, so it leaks no timing signal
/// about how much of a secret matched. Lengths are compared first; the length
/// of a token hash is fixed and not secret.
fn ct_eq(a: &[u8], b: &[u8]) -> bool {
    if a.len() != b.len() {
        return false;
    }
    let mut diff = 0u8;
    for (x, y) in a.iter().zip(b.iter()) {
        diff |= x ^ y;
    }
    diff == 0
}

/// Whether a pairing token's `expires_at` is in the past relative to `now`.
///
/// `None` (SQL `NULL`) means "never expires" — the documented `--ttl-days 0`
/// opt-out. A present-but-unparseable value fails closed (treated as expired).
/// Expiry is compared as a parsed instant rather than via a SQL `expires_at > ?`
/// string compare, which only orders correctly while every stored value is the
/// canonical `now_rfc3339()` shape (#64).
fn is_expired(expires_at: Option<&str>, now: chrono::DateTime<chrono::Utc>) -> bool {
    match expires_at {
        None => false,
        Some(raw) => match chrono::DateTime::parse_from_rfc3339(raw) {
            Ok(dt) => dt <= now,
            Err(_) => true,
        },
    }
}

/// Upper bound on any `LIMIT` we bind. A caller-supplied `limit` (e.g. a daemon
/// request body's `limit`) can be a huge `u64` that, cast straight to `i64`,
/// wraps negative — and SQLite reads a negative `LIMIT` as *unbounded*, so the
/// query returns every row (#128). Clamp at the `usize` level before the cast.
const MAX_QUERY_LIMIT: usize = 10_000;

fn clamp_limit(limit: usize) -> i64 {
    limit.min(MAX_QUERY_LIMIT) as i64
}

/// Upper bound on the rows [`MessagesRepo::list_for_session`] returns (F24/RC-F).
/// A session transcript is unbounded and the daemon `session_messages` path loads
/// it whole into RAM; this caps the worst-case load at the most recent N messages
/// so one pathological session can't OOM the daemon. 5000 turns is far beyond any
/// real interactive session yet bounds memory.
const MAX_SESSION_MESSAGES: i64 = 5_000;

pub(crate) fn fresh_id(prefix: &str) -> String {
    // In-process monotonic counter: two ids minted in the same nanosecond (a
    // coarse clock, or a clock stepping backward) can never be equal, so the
    // `ON CONFLICT(id) DO UPDATE` upserts can't silently overwrite an unrelated
    // row (#61). A per-process random salt removes the clock dependence so ids
    // minted across a daemon restart don't collide either (getrandom is already
    // a dependency — see `daemon.rs`).
    static SEQ: AtomicU64 = AtomicU64::new(0);
    static SALT: OnceLock<u64> = OnceLock::new();
    let salt = *SALT.get_or_init(|| {
        let mut bytes = [0u8; 8];
        // The monotonic counter alone still guarantees in-process uniqueness if
        // the RNG ever fails, so a best-effort fill is fine here.
        let _ = getrandom::fill(&mut bytes);
        u64::from_le_bytes(bytes)
    });
    let nanos = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .map(|d| d.as_nanos())
        .unwrap_or_default();
    let seq = SEQ.fetch_add(1, Ordering::Relaxed);
    format!("{prefix}-{nanos:x}-{salt:x}-{seq:x}")
}

/// Acquire an exclusive, auto-released advisory lock on `path` — a process
/// singleton guard for the daemon (#131). Returns the held `File` on success
/// (keep it alive to hold the lock), or `None` if another process already holds
/// it. `flock` releases automatically when the file is dropped OR the process
/// exits/crashes, so a dead holder never wedges the lock the way an `O_EXCL`
/// pidfile would. Holding it across the socket probe → unlink → bind closes that
/// TOCTOU: two daemons can't both decide a stale socket is theirs to rebind.
///
/// Unix-only: it backs the `#[cfg(unix)]` daemon singleton and relies on
/// `flock`, which `rustix` exposes only on Unix targets.
#[cfg(unix)]
pub fn try_exclusive_lock(path: &std::path::Path) -> std::io::Result<Option<std::fs::File>> {
    use rustix::fs::{FlockOperation, flock};
    // A lockfile's content is irrelevant — only the flock matters — so don't
    // truncate (avoids a needless write and any truncate/lock ordering race).
    let file = std::fs::OpenOptions::new()
        .create(true)
        .write(true)
        .truncate(false)
        .open(path)?;
    match flock(&file, FlockOperation::NonBlockingLockExclusive) {
        Ok(()) => Ok(Some(file)),
        Err(rustix::io::Errno::WOULDBLOCK) => Ok(None),
        Err(e) => Err(e.into()),
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn open_enables_wal_and_busy_timeout() {
        // H19: every connection must use WAL so daemon/CLI/effect writers
        // don't hit a hard SQLITE_BUSY.
        let path = temp_db("wal_check");
        let store = RuntimeStore::open(&path).expect("open");
        let mode: String = store
            .conn
            .query_row("PRAGMA journal_mode", [], |r| r.get(0))
            .expect("journal_mode pragma");
        assert_eq!(mode.to_lowercase(), "wal");
    }

    fn temp_db(name: &str) -> PathBuf {
        let dir = std::env::temp_dir().join(format!("mermaid_runtime_store_{}", name));
        let _ = std::fs::remove_dir_all(&dir);
        std::fs::create_dir_all(&dir).expect("create temp dir");
        dir.join("runtime.sqlite3")
    }

    #[test]
    fn initializes_runtime_schema() {
        let path = temp_db("schema");
        let store = RuntimeStore::open(&path).expect("open store");
        assert_eq!(store.path(), path.as_path());
        let version: i32 = store
            .conn
            .query_row("PRAGMA user_version", [], |row| row.get(0))
            .unwrap();
        assert_eq!(version, SCHEMA_VERSION);
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn rejects_newer_schema_version() {
        // Forward-compat gate: a DB stamped with a newer schema must be
        // refused, not silently down-labeled and operated on (RC-5).
        let path = temp_db("newer_schema");
        {
            let store = RuntimeStore::open(&path).expect("first open");
            store
                .conn
                .execute_batch(&format!("PRAGMA user_version = {};", SCHEMA_VERSION + 1))
                .expect("bump version");
        }
        // `RuntimeStore` isn't `Debug`, so match rather than `expect_err`.
        let err = match RuntimeStore::open(&path) {
            Ok(_) => panic!("must refuse a newer DB"),
            Err(e) => e,
        };
        assert!(
            err.to_string().contains("newer than this build"),
            "unexpected error: {err}"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn init_schema_is_idempotent_across_opens() {
        // Re-opening the same DB re-runs `init_schema`; it must succeed (the
        // create script and `ensure_column` are idempotent) and keep the
        // version stamped.
        let path = temp_db("idempotent_schema");
        let _ = RuntimeStore::open(&path).expect("first open");
        let store = RuntimeStore::open(&path).expect("second open must succeed");
        let version: i32 = store
            .conn
            .query_row("PRAGMA user_version", [], |r| r.get(0))
            .unwrap();
        assert_eq!(version, SCHEMA_VERSION);
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    fn explain_query_plan(conn: &Connection, sql: &str) -> String {
        let mut stmt = conn
            .prepare(&format!("EXPLAIN QUERY PLAN {sql}"))
            .expect("prepare EXPLAIN QUERY PLAN");
        // Column 3 of an EQP row is the human-readable `detail` (e.g.
        // "SEARCH approvals USING INDEX idx_approvals_pending ...").
        let rows = stmt
            .query_map([], |row| row.get::<_, String>(3))
            .expect("eqp query")
            .collect::<rusqlite::Result<Vec<String>>>()
            .expect("eqp rows");
        rows.join("\n")
    }

    #[test]
    fn pending_and_reconcile_scans_use_indexes() {
        // F75: the pending-approval scan and the reconcile scan must hit their
        // covering indexes rather than full-table scans.
        let path = temp_db("scan_indexes");
        let store = RuntimeStore::open(&path).expect("open");

        let index_count: i64 = store
            .conn
            .query_row(
                "SELECT COUNT(*) FROM sqlite_master
                 WHERE type = 'index'
                   AND name IN ('idx_approvals_pending', 'idx_tasks_status_owner')",
                [],
                |r| r.get(0),
            )
            .unwrap();
        assert_eq!(index_count, 2, "F75 indexes must be created");

        // `list_pending`'s scan must use the partial pending index (it also serves
        // the ORDER BY created_at, so no separate sort).
        let plan = explain_query_plan(
            &store.conn,
            "SELECT id FROM approvals WHERE user_decision IS NULL ORDER BY created_at DESC",
        );
        assert!(
            plan.contains("idx_approvals_pending"),
            "pending scan must use idx_approvals_pending; plan was:\n{plan}"
        );

        // `reconcile_after_restart`'s scan must use the (status, owner_kind) index.
        let plan = explain_query_plan(
            &store.conn,
            "SELECT id FROM tasks WHERE status = 'running' AND owner_kind = 'daemon'",
        );
        assert!(
            plan.contains("idx_tasks_status_owner"),
            "reconcile scan must use idx_tasks_status_owner; plan was:\n{plan}"
        );

        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn upgrades_from_v2_to_current_and_adds_indexes() {
        // F75/F76: a DB stamped at the previous schema version must migrate forward
        // on the next open — re-run the idempotent baseline, pick up the F75
        // indexes, and stamp the current version — exercising the per-version
        // dispatch (`from_version = 2` runs the v3 step).
        let path = temp_db("upgrade_v2");
        {
            let store = RuntimeStore::open(&path).expect("first open");
            // Simulate an older v2 DB: drop the new indexes and roll the stamp back.
            store
                .conn
                .execute_batch(
                    "DROP INDEX IF EXISTS idx_approvals_pending;
                     DROP INDEX IF EXISTS idx_tasks_status_owner;
                     PRAGMA user_version = 2;",
                )
                .expect("downgrade to v2");
        }
        let store = RuntimeStore::open(&path).expect("reopen must migrate forward");
        let version: i32 = store
            .conn
            .query_row("PRAGMA user_version", [], |r| r.get(0))
            .unwrap();
        assert_eq!(version, SCHEMA_VERSION);
        let index_count: i64 = store
            .conn
            .query_row(
                "SELECT COUNT(*) FROM sqlite_master
                 WHERE type = 'index'
                   AND name IN ('idx_approvals_pending', 'idx_tasks_status_owner')",
                [],
                |r| r.get(0),
            )
            .unwrap();
        assert_eq!(
            index_count, 2,
            "forward migration must recreate the F75 indexes"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn task_create_commits_task_and_event_atomically() {
        // The task row and its `task_created` event commit in one transaction.
        let path = temp_db("task_txn");
        let store = RuntimeStore::open(&path).expect("open");
        let task = store
            .tasks()
            .create(NewTask::new("do a thing", "/repo", "anthropic/claude"))
            .expect("create task");
        let events = store.tasks().events(&task.id).expect("events");
        assert!(
            events.iter().any(|e| e.kind == "task_created"),
            "the task_created event must commit with the task row"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn task_lifecycle_round_trips() {
        let path = temp_db("task");
        let store = RuntimeStore::open(&path).expect("open store");
        let session = store
            .sessions()
            .upsert(NewSession {
                id: Some("session-1".to_string()),
                project_path: "/repo".to_string(),
                model_id: "anthropic/claude".to_string(),
                title: Some("Run tests".to_string()),
                conversation_path: Some("/repo/.mermaid/session.json".to_string()),
                total_tokens: Some(42),
            })
            .expect("upsert session");
        assert_eq!(session.id, "session-1");
        let message = store
            .messages()
            .add(NewMessage {
                session_id: session.id.clone(),
                role: "user".to_string(),
                content_json: "{\"text\":\"hi\"}".to_string(),
            })
            .expect("add message");
        assert_eq!(message.role, "user");
        assert_eq!(
            store
                .messages()
                .list_for_session(&session.id)
                .unwrap()
                .len(),
            1
        );

        let mut new = NewTask::new("Run tests", "/repo", "anthropic/claude");
        new.priority = TaskPriority::High;
        let task = store.tasks().create(new).expect("create task");

        assert_eq!(task.status, TaskStatus::Queued);
        assert_eq!(task.priority, TaskPriority::High);

        store
            .tasks()
            .update_status(&task.id, TaskStatus::Completed, Some("tests passed"))
            .expect("update task");
        let loaded = store.tasks().get(&task.id).unwrap().unwrap();
        assert_eq!(loaded.status, TaskStatus::Completed);
        assert_eq!(loaded.final_report.as_deref(), Some("tests passed"));

        let events = store.tasks().events(&task.id).expect("events");
        assert_eq!(events.len(), 2);
        assert_eq!(events[0].kind, "task_created");
        assert_eq!(events[1].kind, "status_changed");
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn approval_and_process_records_round_trip() {
        let path = temp_db("approval_process");
        let store = RuntimeStore::open(&path).expect("open store");
        let task = store
            .tasks()
            .create(NewTask::new("Edit files", "/repo", "openai/gpt-5.2"))
            .expect("create task");

        let approval = store
            .approvals()
            .create(NewApproval {
                task_id: Some(task.id.clone()),
                proposed_action: "write_file src/lib.rs".to_string(),
                risk_classification: "file_mutation".to_string(),
                policy_decision: "ask".to_string(),
                args_summary: Some("src/lib.rs".to_string()),
                checkpoint_id: Some("checkpoint-1".to_string()),
                pending_action_json: Some(
                    "{\"tool\":\"write_file\",\"args\":{\"path\":\"src/lib.rs\"}}".to_string(),
                ),
            })
            .expect("create approval");
        store
            .approvals()
            .decide(&approval.id, "approved")
            .expect("decide approval");
        let approval = store.approvals().get(&approval.id).unwrap().unwrap();
        assert_eq!(approval.user_decision.as_deref(), Some("approved"));
        assert!(approval.pending_action_json.is_some());

        let tool_run = store
            .tool_runs()
            .start(NewToolRun {
                id: Some("toolrun-1".to_string()),
                task_id: Some(task.id.clone()),
                turn_id: Some("turn-1".to_string()),
                call_id: Some("call-1".to_string()),
                tool_name: "write_file".to_string(),
                args_json: Some("{\"path\":\"src/lib.rs\"}".to_string()),
            })
            .expect("start tool run");
        assert_eq!(tool_run.status, "running");
        store
            .tool_runs()
            .finish("toolrun-1", "success", Some("{\"summary\":\"ok\"}"))
            .expect("finish tool run");
        let tool_run = store.tool_runs().get("toolrun-1").unwrap().unwrap();
        assert_eq!(tool_run.status, "success");
        assert!(tool_run.finished_at.is_some());

        let process = store
            .processes()
            .upsert(NewProcess {
                id: Some("proc-1".to_string()),
                task_id: Some(task.id),
                pid: 123,
                command: "npm run dev".to_string(),
                cwd: Some("/repo".to_string()),
                log_path: Some("/tmp/mermaid.log".to_string()),
                detected_url: Some("http://127.0.0.1:5173".to_string()),
                status: ProcessStatus::Running,
                health: Some("ready".to_string()),
            })
            .expect("upsert process");
        assert_eq!(process.status, ProcessStatus::Running);
        assert_eq!(store.processes().list(10).unwrap().len(), 1);
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn approval_decide_is_single_shot() {
        let path = temp_db("approval_decide_guard");
        let store = RuntimeStore::open(&path).expect("open store");
        let make = |action: &str| {
            store
                .approvals()
                .create(NewApproval {
                    task_id: None,
                    proposed_action: action.to_string(),
                    risk_classification: "file_mutation".to_string(),
                    policy_decision: "ask".to_string(),
                    args_summary: None,
                    checkpoint_id: None,
                    pending_action_json: None,
                })
                .expect("create approval")
        };

        // A second decision on an already-decided approval is rejected — this
        // is what stops a stored action from being replayed N times.
        let a = make("write_file a");
        store
            .approvals()
            .decide(&a.id, "approved")
            .expect("first decide");
        assert!(
            store.approvals().decide(&a.id, "approved").is_err(),
            "re-approving an approved approval must be rejected"
        );

        // A denied approval cannot be resurrected as approved.
        let b = make("write_file b");
        store.approvals().decide(&b.id, "denied").expect("deny");
        assert!(
            store.approvals().decide(&b.id, "approved").is_err(),
            "a denied approval must not be re-decidable as approved"
        );
        let reloaded = store.approvals().get(&b.id).unwrap().unwrap();
        assert_eq!(reloaded.user_decision.as_deref(), Some("denied"));

        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn archived_approvals_and_checkpoints_are_hidden_from_visible_lists() {
        let path = temp_db("archive_visibility");
        let store = RuntimeStore::open(&path).expect("open store");

        let approval = store
            .approvals()
            .create(NewApproval {
                task_id: None,
                proposed_action: "restore replay: write_file".to_string(),
                risk_classification: "restored_action".to_string(),
                policy_decision: "ask".to_string(),
                args_summary: None,
                checkpoint_id: Some("checkpoint-1".to_string()),
                pending_action_json: Some("{\"tool\":\"write_file\"}".to_string()),
            })
            .expect("create approval");
        let checkpoint = store
            .checkpoints()
            .create(NewCheckpoint {
                id: Some("checkpoint-1".to_string()),
                task_id: None,
                project_path: "/tmp/mermaid_checkpoint_test".to_string(),
                snapshot_path: "/data/checkpoints/checkpoint-1".to_string(),
                changed_files_json: "[]".to_string(),
                pending_action_json: Some("{\"tool\":\"write_file\"}".to_string()),
                approval_id: Some(approval.id.clone()),
            })
            .expect("create checkpoint");

        assert_eq!(store.approvals().list_pending().unwrap().len(), 1);
        assert_eq!(store.approvals().list_pending_all().unwrap().len(), 1);
        assert_eq!(store.approvals().list_all(10).unwrap().len(), 1);
        assert_eq!(store.checkpoints().list(10).unwrap().len(), 1);
        assert_eq!(store.checkpoints().list_all(10).unwrap().len(), 1);

        assert_eq!(
            store
                .approvals()
                .archive(std::slice::from_ref(&approval.id), "runtime hygiene")
                .unwrap(),
            1
        );
        assert_eq!(
            store
                .checkpoints()
                .archive(std::slice::from_ref(&checkpoint.id), "runtime hygiene")
                .unwrap(),
            1
        );
        assert_eq!(
            store
                .approvals()
                .archive(std::slice::from_ref(&approval.id), "runtime hygiene")
                .unwrap(),
            0
        );
        assert_eq!(store.approvals().list_pending().unwrap().len(), 0);
        assert_eq!(store.approvals().list_pending_all().unwrap().len(), 1);
        assert_eq!(store.approvals().list_all(10).unwrap().len(), 1);
        assert_eq!(store.approvals().count_archived().unwrap(), 1);
        assert_eq!(store.checkpoints().list(10).unwrap().len(), 0);
        assert_eq!(store.checkpoints().list_all(10).unwrap().len(), 1);
        assert_eq!(store.checkpoints().count_archived().unwrap(), 1);

        let archived = store.approvals().get(&approval.id).unwrap().unwrap();
        assert!(archived.archived_at.is_some());
        assert_eq!(archived.archive_reason.as_deref(), Some("runtime hygiene"));
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn checkpoint_compaction_plugin_probe_and_pairing_round_trip() {
        let path = temp_db("everything_else");
        let store = RuntimeStore::open(&path).expect("open store");

        let checkpoint = store
            .checkpoints()
            .create(NewCheckpoint {
                id: Some("checkpoint-1".to_string()),
                task_id: None,
                project_path: "/repo".to_string(),
                snapshot_path: "/data/checkpoints/checkpoint-1".to_string(),
                changed_files_json: "[\"src/lib.rs\"]".to_string(),
                pending_action_json: Some("{\"tool\":\"write_file\"}".to_string()),
                approval_id: None,
            })
            .expect("create checkpoint");
        assert_eq!(checkpoint.id, "checkpoint-1");
        assert_eq!(store.checkpoints().list(10).unwrap().len(), 1);

        let compaction = store
            .compactions()
            .create(NewCompaction {
                id: Some("compaction-1".to_string()),
                task_id: None,
                session_id: Some("session-1".to_string()),
                source_token_estimate: Some(10_000),
                summary_token_count: Some(800),
                preserved_turns: Some(6),
                archive_path: Some(".mermaid/compactions/session-1/compaction-1.json".to_string()),
                verification_status: Some("verified".to_string()),
            })
            .expect("create compaction");
        assert_eq!(compaction.summary_token_count, Some(800));
        assert_eq!(store.compactions().list(10).unwrap().len(), 1);

        let plugin = store
            .plugins()
            .install(NewPluginInstall {
                id: Some("plugin-1".to_string()),
                name: "example".to_string(),
                source: "local".to_string(),
                version: Some("0.1.0".to_string()),
                enabled: true,
                manifest_json: "{\"name\":\"example\"}".to_string(),
            })
            .expect("install plugin");
        assert!(plugin.enabled);
        store.plugins().set_enabled("plugin-1", false).unwrap();
        assert!(!store.plugins().get("plugin-1").unwrap().unwrap().enabled);

        let probe = store
            .provider_probes()
            .upsert(NewProviderProbe {
                provider: "cerebras".to_string(),
                model_id: "gpt-oss-120b".to_string(),
                capability_key: "parallel_tool_calls".to_string(),
                capability_value: "false".to_string(),
                confidence: "static".to_string(),
                error: None,
            })
            .expect("probe");
        assert_eq!(probe.confidence, "static");
        assert_eq!(
            store
                .provider_probes()
                .list(Some("cerebras"), Some("gpt-oss-120b"))
                .unwrap()
                .len(),
            1
        );

        let pairing = store
            .pairing_tokens()
            .create("hash", Some("phone"), None)
            .expect("pairing");
        store.pairing_tokens().mark_used(&pairing.id).unwrap();
        assert!(
            store
                .pairing_tokens()
                .get(&pairing.id)
                .unwrap()
                .unwrap()
                .last_used_at
                .is_some()
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn pairing_token_expiry_and_revoke() {
        let path = temp_db("pairing_ttl");
        let store = RuntimeStore::open(&path).expect("open store");
        let tokens = store.pairing_tokens();

        // A never-expiring token verifies.
        let live = tokens
            .create("live_hash", Some("a"), None)
            .expect("create live");
        assert!(tokens.verify_token("live_hash").unwrap().is_some());

        // A future expiry still verifies; a past expiry does not.
        let future = (chrono::Utc::now() + chrono::Duration::days(1)).to_rfc3339();
        tokens
            .create("future_hash", None, Some(&future))
            .expect("create future");
        assert!(tokens.verify_token("future_hash").unwrap().is_some());

        let past = (chrono::Utc::now() - chrono::Duration::days(1)).to_rfc3339();
        tokens
            .create("past_hash", None, Some(&past))
            .expect("create past");
        assert!(
            tokens.verify_token("past_hash").unwrap().is_none(),
            "an expired token must not verify"
        );

        // A future expiry rendered with a non-UTC offset still verifies, even
        // though its RFC3339 string sorts lexically *before* `now_rfc3339()` —
        // this would wrongly read as expired under the old SQL string compare (#64).
        let skewed = (chrono::Utc::now() + chrono::Duration::hours(1))
            .with_timezone(&chrono::FixedOffset::west_opt(3 * 3600).unwrap())
            .to_rfc3339();
        tokens
            .create("skew_hash", None, Some(&skewed))
            .expect("create skewed");
        assert!(
            tokens.verify_token("skew_hash").unwrap().is_some(),
            "a future token in a non-UTC offset must verify (parsed-instant compare)"
        );

        // A present-but-unparseable expiry fails closed (treated as expired).
        tokens
            .create("garbage_hash", None, Some("not-a-timestamp"))
            .expect("create garbage");
        assert!(
            tokens.verify_token("garbage_hash").unwrap().is_none(),
            "an unparseable expiry must fail closed"
        );

        // Revoking disables the token.
        assert!(tokens.revoke(&live.id).unwrap());
        assert!(tokens.verify_token("live_hash").unwrap().is_none());
        assert!(
            !tokens.revoke(&live.id).unwrap(),
            "double revoke is a no-op"
        );

        // A non-matching hash never verifies.
        assert!(tokens.verify_token("nope").unwrap().is_none());

        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn ct_eq_matches_only_identical_bytes() {
        assert!(ct_eq(b"abc", b"abc"));
        assert!(!ct_eq(b"abc", b"abd"));
        assert!(!ct_eq(b"abc", b"ab"));
        assert!(!ct_eq(b"", b"x"));
        assert!(ct_eq(b"", b""));
    }

    #[test]
    fn fresh_id_is_collision_free_in_tight_loop() {
        // The #61 stress: ids minted back-to-back (same nanosecond on a coarse
        // clock) must all be distinct and keep the `prefix-` shape.
        let mut seen = std::collections::HashSet::new();
        for _ in 0..10_000 {
            let id = fresh_id("process");
            assert!(id.starts_with("process-"), "id must keep prefix: {id}");
            assert!(seen.insert(id), "fresh_id produced a duplicate");
        }
    }

    #[test]
    fn ensure_column_rejects_non_identifier() {
        let path = temp_db("ensure_col");
        let store = RuntimeStore::open(&path).expect("open store");
        assert!(ensure_column(&store.conn, "approvals; DROP", "x", "TEXT").is_err());
        assert!(ensure_column(&store.conn, "approvals", "x-y", "TEXT").is_err());
        assert!(ensure_column(&store.conn, "approvals", "x", "TEXT; DROP").is_err());
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn clamp_limit_never_binds_negative() {
        // #128: a huge `limit` must clamp, not wrap to a negative i64 (which
        // SQLite reads as unbounded).
        assert_eq!(clamp_limit(10), 10);
        assert_eq!(clamp_limit(usize::MAX), MAX_QUERY_LIMIT as i64);
        assert!(clamp_limit(usize::MAX) > 0);
    }

    fn make_approval(store: &RuntimeStore, action: &str) -> ApprovalRecord {
        store
            .approvals()
            .create(NewApproval {
                task_id: None,
                proposed_action: action.to_string(),
                risk_classification: "shell_mutation".to_string(),
                policy_decision: "ask".to_string(),
                args_summary: None,
                checkpoint_id: None,
                pending_action_json: None,
            })
            .expect("create approval")
    }

    #[test]
    fn approval_claim_is_single_winner_releasable_and_finalizable() {
        // #118: exactly one concurrent claim wins; a released claim re-claims; a
        // finalized one is decided and unclaimable.
        let path = temp_db("approval_claim");
        let store = RuntimeStore::open(&path).expect("open store");
        let a = make_approval(&store, "write_file a");

        assert!(store.approvals().claim(&a.id).unwrap(), "first claim wins");
        assert!(
            !store.approvals().claim(&a.id).unwrap(),
            "second claim loses"
        );

        store.approvals().release_claim(&a.id).unwrap();
        assert!(
            store.approvals().claim(&a.id).unwrap(),
            "a released claim is re-claimable (effect-failed path)"
        );

        store
            .approvals()
            .finalize_claimed(&a.id, "approved")
            .unwrap();
        assert_eq!(
            store
                .approvals()
                .get(&a.id)
                .unwrap()
                .unwrap()
                .user_decision
                .as_deref(),
            Some("approved")
        );
        assert!(
            !store.approvals().claim(&a.id).unwrap(),
            "a decided approval cannot be claimed"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn reconcile_after_restart_recovers_running_tasks_and_claims() {
        // #120/#118: a daemon-owned Running task and an 'approving' claim left by a
        // crashed daemon are recovered on the next startup.
        let path = temp_db("reconcile");
        let store = RuntimeStore::open(&path).expect("open store");
        let task = store
            .tasks()
            .create(NewTask::new("t", "/repo", "m").daemon_owned())
            .expect("create task");
        store
            .tasks()
            .update_status(&task.id, TaskStatus::Running, None)
            .expect("mark running");
        let appr = make_approval(&store, "git push");
        assert!(store.approvals().claim(&appr.id).unwrap());

        let (tasks, claims) = store.reconcile_after_restart().expect("reconcile");
        assert_eq!((tasks, claims), (1, 1));
        assert_eq!(
            store.tasks().get(&task.id).unwrap().unwrap().status,
            TaskStatus::Failed
        );
        assert!(
            store
                .approvals()
                .get(&appr.id)
                .unwrap()
                .unwrap()
                .user_decision
                .is_none(),
            "a released claim is undecided and re-runnable"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn reconcile_after_restart_spares_non_daemon_running_tasks() {
        // F18 (RC-E): a Running task NOT owned by the daemon (an interactive CLI
        // run sharing the store, owner_kind = NULL) must survive a daemon restart
        // — not be flipped to Failed with a spurious "interrupted" event.
        let path = temp_db("reconcile_spare_cli");
        let store = RuntimeStore::open(&path).expect("open store");

        let cli = store
            .tasks()
            .create(NewTask::new("cli run", "/repo", "m")) // no .daemon_owned()
            .expect("create cli task");
        store
            .tasks()
            .update_status(&cli.id, TaskStatus::Running, None)
            .expect("mark cli running");
        let daemon = store
            .tasks()
            .create(NewTask::new("daemon run", "/repo", "m").daemon_owned())
            .expect("create daemon task");
        store
            .tasks()
            .update_status(&daemon.id, TaskStatus::Running, None)
            .expect("mark daemon running");

        let (tasks, _claims) = store.reconcile_after_restart().expect("reconcile");
        assert_eq!(tasks, 1, "only the daemon-owned task is reset");
        assert_eq!(
            store.tasks().get(&cli.id).unwrap().unwrap().status,
            TaskStatus::Running,
            "a live CLI task must NOT be clobbered by the daemon's reconcile"
        );
        assert_eq!(
            store.tasks().get(&daemon.id).unwrap().unwrap().status,
            TaskStatus::Failed,
            "a stranded daemon task is still recovered"
        );
        // The spared CLI task gets no "interrupted" event.
        assert!(
            !store
                .tasks()
                .events(&cli.id)
                .unwrap()
                .iter()
                .any(|e| e.kind == "interrupted"),
            "the spared task must not receive a spurious interrupted event"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn gc_prunes_old_archived_but_keeps_active() {
        // #130: GC removes archived rows past the retention window, never active
        // ones.
        let path = temp_db("gc");
        let store = RuntimeStore::open(&path).expect("open store");
        let keep = make_approval(&store, "active");
        let gone = make_approval(&store, "old archived");
        store
            .approvals()
            .archive(std::slice::from_ref(&gone.id), "test")
            .expect("archive");
        // Backdate the archive far past the window.
        store
            .conn
            .execute(
                "UPDATE approvals SET archived_at = ?2 WHERE id = ?1",
                params![gone.id, "2000-01-01T00:00:00+00:00"],
            )
            .unwrap();

        let removed = store.gc(30).expect("gc");
        assert!(removed >= 1, "the old archived approval should be pruned");
        assert!(
            store.approvals().get(&gone.id).unwrap().is_none(),
            "old archived row removed"
        );
        assert!(
            store.approvals().get(&keep.id).unwrap().is_some(),
            "active row kept"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn gc_prunes_high_churn_and_old_terminal_rows_but_keeps_active() {
        // F22 (RC-F): GC prunes finished tool_runs, exited processes, old
        // compactions, and stale sessions/messages past the window — never active
        // data (a running tool_run, a live process, a fresh session).
        let path = temp_db("gc_high_churn");
        let store = RuntimeStore::open(&path).expect("open store");
        let old = "2000-01-01T00:00:00+00:00";

        // Stale session + message (deleted) vs active session + message (kept).
        let stale_session = store
            .sessions()
            .upsert(NewSession {
                id: Some("stale".to_string()),
                project_path: "/repo".to_string(),
                model_id: "m".to_string(),
                title: None,
                conversation_path: None,
                total_tokens: None,
            })
            .expect("stale session");
        store
            .messages()
            .add(NewMessage {
                session_id: stale_session.id.clone(),
                role: "user".to_string(),
                content_json: "{}".to_string(),
            })
            .expect("stale message");
        let active_session = store
            .sessions()
            .upsert(NewSession {
                id: Some("active".to_string()),
                project_path: "/repo".to_string(),
                model_id: "m".to_string(),
                title: None,
                conversation_path: None,
                total_tokens: None,
            })
            .expect("active session");
        store
            .messages()
            .add(NewMessage {
                session_id: active_session.id.clone(),
                role: "user".to_string(),
                content_json: "{}".to_string(),
            })
            .expect("active message");
        store
            .conn
            .execute(
                "UPDATE sessions SET updated_at = ?2 WHERE id = ?1",
                params![stale_session.id, old],
            )
            .unwrap();

        // Finished (old) tool_run deleted; running tool_run kept.
        store
            .tool_runs()
            .start(NewToolRun {
                id: Some("tr-finished".to_string()),
                task_id: None,
                turn_id: None,
                call_id: None,
                tool_name: "x".to_string(),
                args_json: None,
            })
            .expect("start finished tr");
        store
            .tool_runs()
            .finish("tr-finished", "success", None)
            .expect("finish tr");
        store
            .conn
            .execute(
                "UPDATE tool_runs SET finished_at = ?2 WHERE id = ?1",
                params!["tr-finished", old],
            )
            .unwrap();
        store
            .tool_runs()
            .start(NewToolRun {
                id: Some("tr-running".to_string()),
                task_id: None,
                turn_id: None,
                call_id: None,
                tool_name: "x".to_string(),
                args_json: None,
            })
            .expect("start running tr");

        // Exited (old) process deleted; running process kept.
        let exited = store
            .processes()
            .upsert(NewProcess {
                id: Some("p-exited".to_string()),
                task_id: None,
                pid: 1,
                command: "c".to_string(),
                cwd: None,
                log_path: None,
                detected_url: None,
                status: ProcessStatus::Exited,
                health: None,
            })
            .expect("exited process");
        store
            .conn
            .execute(
                "UPDATE processes SET updated_at = ?2 WHERE id = ?1",
                params![exited.id, old],
            )
            .unwrap();
        let running_proc = store
            .processes()
            .upsert(NewProcess {
                id: Some("p-running".to_string()),
                task_id: None,
                pid: 2,
                command: "c".to_string(),
                cwd: None,
                log_path: None,
                detected_url: None,
                status: ProcessStatus::Running,
                health: None,
            })
            .expect("running process");

        // Old compaction deleted.
        let comp = store
            .compactions()
            .create(NewCompaction {
                id: Some("comp-old".to_string()),
                task_id: None,
                session_id: None,
                source_token_estimate: None,
                summary_token_count: None,
                preserved_turns: None,
                archive_path: None,
                verification_status: None,
            })
            .expect("compaction");
        store
            .conn
            .execute(
                "UPDATE compactions SET created_at = ?2 WHERE id = ?1",
                params![comp.id, old],
            )
            .unwrap();

        let removed = store.gc(30).expect("gc");
        assert!(removed >= 5, "stale rows pruned (got {removed})");
        assert!(
            store.sessions().get(&stale_session.id).unwrap().is_none(),
            "stale session gone"
        );
        assert!(
            store
                .messages()
                .list_for_session(&stale_session.id)
                .unwrap()
                .is_empty(),
            "stale messages gone"
        );
        assert!(
            store.sessions().get(&active_session.id).unwrap().is_some(),
            "active session kept"
        );
        assert_eq!(
            store
                .messages()
                .list_for_session(&active_session.id)
                .unwrap()
                .len(),
            1,
            "active message kept"
        );
        assert!(
            store.tool_runs().get("tr-finished").unwrap().is_none(),
            "old finished tool_run gone"
        );
        assert!(
            store.tool_runs().get("tr-running").unwrap().is_some(),
            "running tool_run kept"
        );
        assert!(
            store.processes().get(&exited.id).unwrap().is_none(),
            "old exited process gone"
        );
        assert!(
            store.processes().get(&running_proc.id).unwrap().is_some(),
            "running process kept"
        );
        assert!(
            store.compactions().get(&comp.id).unwrap().is_none(),
            "old compaction gone"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn task_list_skips_undecodable_status_row() {
        // F19 (RC-E): a task row whose status enum this build can't decode (a
        // different binary wrote it) is skipped, not allowed to blank the list.
        let path = temp_db("poison_task");
        let store = RuntimeStore::open(&path).expect("open store");
        let good = store
            .tasks()
            .create(NewTask::new("good", "/repo", "m"))
            .expect("create good task");
        store
            .conn
            .execute(
                "INSERT INTO tasks
                 (id, title, status, priority, project_path, model_id, created_at, updated_at)
                 VALUES ('poison', 't', 'from_the_future', 'normal', '/repo', 'm', ?1, ?1)",
                params![now_rfc3339()],
            )
            .unwrap();
        let listed = store.tasks().list(50).expect("list");
        assert_eq!(
            listed.len(),
            1,
            "the poison row is skipped, the good row remains"
        );
        assert_eq!(listed[0].id, good.id);
        // The strict get() path still surfaces the poison row as an error.
        assert!(store.tasks().get("poison").is_err(), "get() stays strict");
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn checkpoint_delete_removes_row() {
        // F23 (RC-F): the on-disk dir GC drops a checkpoint's DB row so list()
        // and the on-disk dirs stay in agreement.
        let path = temp_db("ckpt_delete");
        let store = RuntimeStore::open(&path).expect("open store");
        let ckpt = store
            .checkpoints()
            .create(NewCheckpoint {
                id: Some("ckpt-1".to_string()),
                task_id: None,
                project_path: "/repo".to_string(),
                snapshot_path: "/data/checkpoints/ckpt-1".to_string(),
                changed_files_json: "[]".to_string(),
                pending_action_json: None,
                approval_id: None,
            })
            .expect("create checkpoint");
        assert!(store.checkpoints().get(&ckpt.id).unwrap().is_some());
        assert!(store.checkpoints().delete(&ckpt.id).unwrap(), "row deleted");
        assert!(
            store.checkpoints().get(&ckpt.id).unwrap().is_none(),
            "row gone"
        );
        assert!(
            !store.checkpoints().delete(&ckpt.id).unwrap(),
            "second delete is a no-op"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }

    #[test]
    fn list_for_session_caps_at_max_and_keeps_ascending_order() {
        // F24 (RC-F): a huge session is bounded — list_for_session returns at most
        // MAX_SESSION_MESSAGES, the most recent ones, in ascending id order.
        let path = temp_db("session_cap");
        let store = RuntimeStore::open(&path).expect("open store");
        let session = store
            .sessions()
            .upsert(NewSession {
                id: Some("big".to_string()),
                project_path: "/repo".to_string(),
                model_id: "m".to_string(),
                title: None,
                conversation_path: None,
                total_tokens: None,
            })
            .expect("session");
        let total = MAX_SESSION_MESSAGES + 10;
        let now = now_rfc3339();
        let tx = store.conn.unchecked_transaction().unwrap();
        for i in 0..total {
            tx.execute(
                "INSERT INTO messages (session_id, role, content_json, created_at)
                 VALUES (?1, 'user', ?2, ?3)",
                params![session.id, format!("{{\"n\":{i}}}"), now],
            )
            .unwrap();
        }
        tx.commit().unwrap();
        let listed = store
            .messages()
            .list_for_session(&session.id)
            .expect("list");
        assert_eq!(
            listed.len() as i64,
            MAX_SESSION_MESSAGES,
            "capped at the max"
        );
        assert!(
            listed.windows(2).all(|w| w[0].id < w[1].id),
            "ascending id order preserved across the capped tail"
        );
        let _ = std::fs::remove_dir_all(path.parent().unwrap());
    }
}