Preserve phase timings across resume runs

video_ai_analysis_poc/cli.py

@@ -33,6 +33,22 @@ def _new_phase_timings() -> dict[str, object]:
     }
 
 
+def _load_phase_timings(path: Path, *, resume: bool) -> dict[str, object]:
+    if not resume or not path.exists():
+        return _new_phase_timings()
+    try:
+        phase_timings = json.loads(path.read_text(encoding="utf-8"))
+    except (OSError, json.JSONDecodeError):
+        return _new_phase_timings()
+    if not isinstance(phase_timings, dict):
+        return _new_phase_timings()
+    if phase_timings.get("schema_version") != "phase-timings-v1":
+        return _new_phase_timings()
+    if not isinstance(phase_timings.get("phases"), dict):
+        phase_timings["phases"] = {}
+    return phase_timings
+
+
 def _write_phase_timings(
     output_dir: Path,
     phase_timings: dict[str, object],
@@ -104,10 +120,13 @@ def main(argv: Sequence[str] | None = None) -> int:
 
     output_dir = Path(config["output"]["dir"])
     output_dir.mkdir(parents=True, exist_ok=True)
-    phase_timings = _new_phase_timings()
 
     video_manifest_path = output_dir / "video_manifest.jsonl"
     resume_enabled = bool(config.get("output", {}).get("resume", False))
+    phase_timings = _load_phase_timings(
+        output_dir / "phase_timings.json",
+        resume=resume_enabled,
+    )
     records = _load_resume_records(
         video_manifest_path,
         resume=resume_enabled,