topodb 0.0.1

Embedded, local-first memory engine for AI agents: temporal property graph + scoped recall.
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

use crate::ids::{EdgeId, NodeId, Scope};
use crate::props::Props;
use serde::{Deserialize, Serialize};
use smol_str::SmolStr;

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct NodeRecord {
    pub id: NodeId,
    pub scope: Scope,
    pub label: SmolStr,
    pub props: Props,
    pub embedding: Option<(String, Vec<f32>)>,
}

#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
pub struct EdgeRecord {
    pub id: EdgeId,
    pub scope: Scope,
    pub ty: SmolStr,
    pub from: NodeId,
    pub to: NodeId,
    pub props: Props,
    pub valid_from: i64,
    pub valid_to: Option<i64>,
}

#[cfg(test)]
mod tests {
    use crate::ids::*;
    use crate::op::Op;
    use crate::storage::Storage;

    fn db() -> (tempfile::TempDir, Storage) {
        let dir = tempfile::tempdir().unwrap();
        let s = Storage::create(dir.path().join("t.redb")).unwrap();
        (dir, s)
    }

    #[test]
    fn create_edge_resolves_valid_from_and_persists() {
        let (_d, s) = db();
        let scope = Scope::Id(ScopeId::new());
        let (a, b, e) = (NodeId::new(), NodeId::new(), EdgeId::new());
        let batch = s
            .apply_batch(
                vec![
                    Op::CreateNode { id: a, scope, label: "Memory".into(), props: Default::default() },
                    Op::CreateNode { id: b, scope, label: "Entity".into(), props: Default::default() },
                    Op::CreateEdge {
                        id: e,
                        scope,
                        ty: "ABOUT".into(),
                        from: a,
                        to: b,
                        props: Default::default(),
                        valid_from: None,
                    },
                ],
                1_000,
            )
            .unwrap();
        // Stored op is fully resolved:
        match &batch.resolved[2] {
            Op::CreateEdge { valid_from, .. } => assert_eq!(*valid_from, Some(1_000)),
            other => panic!("unexpected {other:?}"),
        }
        let edge = s.load_edge(e).unwrap().unwrap();
        assert_eq!(edge.valid_from, 1_000);
        assert_eq!(edge.valid_to, None);
    }

    #[test]
    fn cross_scope_edge_requires_shared_endpoint() {
        let (_d, s) = db();
        let (s1, s2) = (Scope::Id(ScopeId::new()), Scope::Id(ScopeId::new()));
        let (a, b) = (NodeId::new(), NodeId::new());
        let err = s
            .apply_batch(
                vec![
                    Op::CreateNode { id: a, scope: s1, label: "Memory".into(), props: Default::default() },
                    Op::CreateNode { id: b, scope: s2, label: "Entity".into(), props: Default::default() },
                    Op::CreateEdge {
                        id: EdgeId::new(),
                        scope: s1,
                        ty: "ABOUT".into(),
                        from: a,
                        to: b,
                        props: Default::default(),
                        valid_from: None,
                    },
                ],
                0,
            )
            .unwrap_err();
        assert!(matches!(err, crate::TopoError::Rejected(_)));
        // Whole batch rejected — nodes must NOT exist:
        assert!(s.load_node(a).unwrap().is_none());

        // With a Shared endpoint it works:
        s.apply_batch(
            vec![
                Op::CreateNode { id: a, scope: s1, label: "Memory".into(), props: Default::default() },
                Op::CreateNode { id: b, scope: Scope::Shared, label: "Entity".into(), props: Default::default() },
                Op::CreateEdge {
                    id: EdgeId::new(),
                    scope: s1,
                    ty: "ABOUT".into(),
                    from: a,
                    to: b,
                    props: Default::default(),
                    valid_from: None,
                },
            ],
            0,
        )
        .unwrap();
    }

    #[test]
    fn remove_node_removes_incident_edges() {
        let (_d, s) = db();
        let scope = Scope::Id(ScopeId::new());
        let (a, b, e) = (NodeId::new(), NodeId::new(), EdgeId::new());
        s.apply_batch(
            vec![
                Op::CreateNode { id: a, scope, label: "M".into(), props: Default::default() },
                Op::CreateNode { id: b, scope, label: "M".into(), props: Default::default() },
                Op::CreateEdge {
                    id: e,
                    scope,
                    ty: "RELATES_TO".into(),
                    from: a,
                    to: b,
                    props: Default::default(),
                    valid_from: None,
                },
            ],
            0,
        )
        .unwrap();
        s.apply_batch(vec![Op::RemoveNode { id: a }], 1).unwrap();
        assert!(s.load_node(a).unwrap().is_none());
        assert!(s.load_edge(e).unwrap().is_none());
    }

    #[test]
    fn remove_node_missing_is_rejected() {
        let (_d, s) = db();
        let err = s.apply_batch(vec![Op::RemoveNode { id: NodeId::new() }], 0).unwrap_err();
        assert!(matches!(err, crate::TopoError::Rejected(_)));
    }

    #[test]
    fn remove_node_removes_incident_edge_in_to_direction() {
        let (_d, s) = db();
        let scope = Scope::Id(ScopeId::new());
        let (a, b, e) = (NodeId::new(), NodeId::new(), EdgeId::new());
        s.apply_batch(
            vec![
                Op::CreateNode { id: a, scope, label: "M".into(), props: Default::default() },
                Op::CreateNode { id: b, scope, label: "M".into(), props: Default::default() },
                Op::CreateEdge {
                    id: e,
                    scope,
                    ty: "RELATES_TO".into(),
                    from: a,
                    to: b,
                    props: Default::default(),
                    valid_from: None,
                },
            ],
            0,
        )
        .unwrap();
        // Remove b, the edge's `to` endpoint — must also delete the edge.
        s.apply_batch(vec![Op::RemoveNode { id: b }], 1).unwrap();
        assert!(s.load_node(b).unwrap().is_none());
        assert!(s.load_edge(e).unwrap().is_none());
    }

    #[test]
    fn create_edge_missing_endpoint_is_rejected() {
        let (_d, s) = db();
        let scope = Scope::Id(ScopeId::new());
        let (a, b) = (NodeId::new(), NodeId::new());
        // Only `a` is created; `b` never exists.
        let err = s
            .apply_batch(
                vec![
                    Op::CreateNode { id: a, scope, label: "M".into(), props: Default::default() },
                    Op::CreateEdge {
                        id: EdgeId::new(),
                        scope,
                        ty: "ABOUT".into(),
                        from: a,
                        to: b,
                        props: Default::default(),
                        valid_from: None,
                    },
                ],
                0,
            )
            .unwrap_err();
        assert!(matches!(err, crate::TopoError::Rejected(_)));
        // Whole batch rejected — nothing committed, not even the CreateNode:
        assert!(s.load_node(a).unwrap().is_none());
        assert!(s.read_ops(1).unwrap().is_empty());
    }

    #[test]
    fn close_edge_missing_is_rejected() {
        let (_d, s) = db();
        let err = s
            .apply_batch(vec![Op::CloseEdge { id: EdgeId::new(), valid_to: None }], 0)
            .unwrap_err();
        assert!(matches!(err, crate::TopoError::Rejected(_)));
    }

    #[test]
    fn close_edge_already_closed_is_rejected() {
        let (_d, s) = db();
        let scope = Scope::Id(ScopeId::new());
        let (a, b, e) = (NodeId::new(), NodeId::new(), EdgeId::new());
        s.apply_batch(
            vec![
                Op::CreateNode { id: a, scope, label: "M".into(), props: Default::default() },
                Op::CreateNode { id: b, scope, label: "M".into(), props: Default::default() },
                Op::CreateEdge {
                    id: e,
                    scope,
                    ty: "ABOUT".into(),
                    from: a,
                    to: b,
                    props: Default::default(),
                    valid_from: None,
                },
            ],
            0,
        )
        .unwrap();
        s.apply_batch(vec![Op::CloseEdge { id: e, valid_to: None }], 1).unwrap();
        let err = s.apply_batch(vec![Op::CloseEdge { id: e, valid_to: None }], 2).unwrap_err();
        assert!(matches!(err, crate::TopoError::Rejected(_)));
        // The first close still stands — the second (rejected) batch never committed.
        let edge = s.load_edge(e).unwrap().unwrap();
        assert_eq!(edge.valid_to, Some(1));
    }
}