feat(corroboration): orchestrator + persistence over both citation graphs (X11)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

mcp-server/src/legal_mcp/services/db.py

@@ -3398,6 +3398,47 @@ async def nearest_halacha_for_vector(case_law_id: UUID, vec: list[float]) -> tup
     return (row["id"], float(row["sim"])) if row else None
 
 
+async def incoming_citations_for_precedent(case_law_id: UUID) -> list[dict]:
+    """All incoming citations (both graphs) with their context + source id."""
+    pool = await get_pool()
+    rows = await pool.fetch(
+        "SELECT id::text AS source_id, source_case_law_id::text AS citing_case_law_id, "
+        "       NULL::text AS citing_decision_id, match_context AS context "
+        "FROM precedent_internal_citations WHERE cited_case_law_id = $1 "
+        "UNION ALL "
+        "SELECT id::text, NULL, decision_id::text, context_text "
+        "FROM case_law_citations WHERE case_law_id = $1",
+        case_law_id,
+    )
+    return [dict(r) for r in rows]
+
+
+async def store_corroboration(
+    halacha_id: str,
+    source_id: str,
+    citing_case_law_id,
+    citing_decision_id,
+    treatment: str,
+    score: float,
+    context: str,
+) -> None:
+    from uuid import UUID as _UUID
+    pool = await get_pool()
+    # asyncpg requires UUID objects for uuid-typed columns; convert non-None strings.
+    h_id = _UUID(halacha_id) if isinstance(halacha_id, str) else halacha_id
+    s_id = _UUID(source_id) if isinstance(source_id, str) else source_id
+    cl_id = _UUID(citing_case_law_id) if (citing_case_law_id and isinstance(citing_case_law_id, str)) else citing_case_law_id
+    d_id = _UUID(citing_decision_id) if (citing_decision_id and isinstance(citing_decision_id, str)) else citing_decision_id
+    await pool.execute(
+        "INSERT INTO halacha_citation_corroboration "
+        "(halacha_id, citing_case_law_id, citing_decision_id, source_citation_id, treatment, match_score, match_context) "
+        "VALUES ($1,$2,$3,$4,$5,$6,$7) "
+        "ON CONFLICT (halacha_id, source_citation_id) DO UPDATE SET "
+        "treatment=EXCLUDED.treatment, match_score=EXCLUDED.match_score",
+        h_id, cl_id, d_id, s_id, treatment, score, context,
+    )
+
+
 async def search_precedent_library_semantic(
     query_embedding: list[float],
     practice_area: str = "",