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feat: add BLIF Flow v2 shadow compare cutover layer

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plx
2026-08-16 00:12:20 +00:00
parent 3b60c3fb70
commit 32e7773957
7 changed files with 417 additions and 24 deletions
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11
app/blif_flow_v2_projection_service.py
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@@ -102,14 +102,15 @@ def rebuild_blif_flow_v2_projection(
) -> dict[str, Any]:
"""Idempotently rebuild projection rows and state-change transitions.
``off`` is a no-op. ``shadow`` writes only additive projection tables.
Compare/authoritative behavior is deliberately not implemented.
``off`` is a no-op. ``shadow`` and ``compare`` write only the same additive
projection tables. Compare affects observation at the read boundary, never
the persisted business rows. Authoritative remains deliberately disabled.
"""
selected_mode = str(mode or settings.blif_flow_v2_mode or "off").strip().lower()
if selected_mode == "off":
return {"mode": "off", "projection_count": 0, "transitions_written": 0, "disabled": True}
if selected_mode != "shadow":
raise RuntimeError(f"BLIF Flow v2 mode {selected_mode!r} is not implemented; only off/shadow are safe")
if selected_mode not in {"shadow", "compare"}:
raise RuntimeError(f"BLIF Flow v2 mode {selected_mode!r} is disabled; only off/shadow/compare are safe")
if not re.fullmatch(r"[a-z_][a-z0-9_]*", target_schema):
raise ValueError("invalid target_schema")
@@ -208,7 +209,7 @@ def rebuild_blif_flow_v2_projection(
conn.close()
return {
"mode": "shadow", "projection_count": len(values),
"mode": selected_mode, "projection_count": len(values),
"canonical_count": sum(not value["is_duplicate_representation"] for value in values),
"duplicate_count": sum(value["is_duplicate_representation"] for value in values),
"transitions_written": transitions_written, "disabled": False,