# Replay Starting Points
Uses the shared generic schema from [Practical Examples](./overview.md).
Replay start parameters control where historical delivery begins.
Choose `from_id` when you track sequence progress; choose `from_date` when you track wall-clock time.
These examples cover valid forms and the common invalid combinations that return `400`.
Use this page to validate client retry and resume logic.
## Replay from Sequence (`from_id`)
```bash
curl -N -X POST "http://127.0.0.1:8000/api/v1/replay" \
-H "Content-Type: application/json" \
-d '{
"event_type":"extreme_event",
"identifier":{"region":"north","run_time":"1200","severity":"4","anomaly":"42.5"},
"from_id":"10"
}'
```
Expected:
- HTTP `200`
- replay starts from sequence `10` (inclusive)
## Replay from Time (`from_date`) RFC3339
```bash
curl -N -X POST "http://127.0.0.1:8000/api/v1/replay" \
-H "Content-Type: application/json" \
-d '{
"event_type":"extreme_event",
"identifier":{"region":"north","run_time":"1200","severity":"4","anomaly":"42.5"},
"from_date":"2026-03-01T12:00:00Z"
}'
```
Expected:
- HTTP `200`
- replay starts from that UTC timestamp (inclusive)
## Replay from Time (`from_date`) Unix Seconds
```bash
curl -N -X POST "http://127.0.0.1:8000/api/v1/replay" \
-H "Content-Type: application/json" \
-d '{
"event_type":"extreme_event",
"identifier":{"region":"north","run_time":"1200","severity":"4","anomaly":"42.5"},
"from_date":"1740509903"
}'
```
Expected:
- HTTP `200`
## Replay from Time (`from_date`) Unix Milliseconds
```bash
curl -N -X POST "http://127.0.0.1:8000/api/v1/replay" \
-H "Content-Type: application/json" \
-d '{
"event_type":"extreme_event",
"identifier":{"region":"north","run_time":"1200","severity":"4","anomaly":"42.5"},
"from_date":"1740509903710"
}'
```
Expected:
- HTTP `200`
## Invalid Replay Start Combinations
### Missing Both `from_id` and `from_date`
```bash
curl -sS -X POST "http://127.0.0.1:8000/api/v1/replay" \
-H "Content-Type: application/json" \
-d '{
"event_type":"extreme_event",
"identifier":{"region":"north","run_time":"1200","severity":"4","anomaly":"42.5"}
}'
```
Expected:
- HTTP `400`
### Both `from_id` and `from_date` Provided
```bash
curl -sS -X POST "http://127.0.0.1:8000/api/v1/watch" \
-H "Content-Type: application/json" \
-d '{
"event_type":"extreme_event",
"identifier":{"region":"north","run_time":"1200","severity":"4","anomaly":"42.5"},
"from_id":"5",
"from_date":"2026-03-01T12:00:00Z"
}'
```
Expected:
- HTTP `400`