feat(audit): record user_id on log events

backend/src/cyclone/api.py

@@ -41,6 +41,21 @@ from sqlalchemy.exc import IntegrityError
 from cyclone.inbox_state import apply_999_rejections
 from cyclone.inbox_state_277ca import apply_277ca_rejections
 from cyclone.audit_log import AuditEvent, append_event, verify_chain
+
+
+def _actor_user_id(request: Request) -> int | None:
+    """Return the acting user's id from ``request.state.user``, or None.
+
+    ``get_current_user``/``matrix_gate`` populate ``request.state.user``
+    for both the authenticated path and the AUTH_DISABLED escape hatch.
+    Returns None when the state hasn't been set (e.g. background jobs
+    or unit tests that bypass auth). Used to stamp ``user_id`` onto
+    audit events without crashing the request.
+    """
+    user = getattr(request.state, "user", None)
+    if user is None:
+        return None
+    return getattr(user, "id", None)
 from cyclone.parsers.exceptions import CycloneParseError
 from cyclone.parsers.models import BatchSummary, ClaimOutput, Envelope, ParseResult
 from cyclone.parsers.models_270 import (
@@ -766,6 +781,7 @@ async def parse_999_endpoint(
                     entity_id=cid,
                     payload={"source_batch_id": synthetic_id, "ack_id": row.id},
                     actor="999-parser",
+                    user_id=_actor_user_id(request),
                 ))
             audit_s.commit()
 
@@ -989,6 +1005,7 @@ async def parse_277ca_endpoint(
                         "277ca_id": row.id,
                     },
                     actor="277ca-parser",
+                    user_id=_actor_user_id(request),
                 ))
             audit_s.commit()
     if apply_result.orphans:
@@ -2526,7 +2543,7 @@ def get_clearhouse():
 
 
 @app.post("/api/clearhouse/submit")
-def submit_to_clearhouse(body: dict):
+def submit_to_clearhouse(request: Request, body: dict):
     """Submit a batch of claims to the clearhouse (SFTP). SP9: stub.
 
     Body: ``{"claim_ids": [...], "payer_id": "CO_TXIX"}``
@@ -2654,6 +2671,7 @@ def submit_to_clearhouse(body: dict):
                     "stub": ch.sftp_block.stub,
                 },
                 actor="clearhouse-submit",
+                user_id=_actor_user_id(request),
             ))
             audit_s.commit()
     return {"ok": True, "submitted": results, "stub": ch.sftp_block.stub}

backend/src/cyclone/audit_log.py

@@ -103,6 +103,12 @@ class AuditEvent:
     computed hash. Payload must be JSON-serializable; the audit_log
     module handles the encoding so callers don't need to think about
     canonical form.
+
+    ``user_id`` is the authenticated actor for this event, when known
+    (e.g. a parse-999 call made by user 7). It's stored on the row but
+    is NOT part of the hash chain — the chain hashes only the fields
+    that existed pre-SP-auth so verify_chain stays compatible with
+    pre-auth rows.
     """
 
     event_type: str
@@ -111,6 +117,7 @@ class AuditEvent:
     payload: dict[str, Any] = field(default_factory=dict)
     actor: str = "system"
     created_at: datetime | None = None
+    user_id: int | None = None
 
 
 def append_event(
@@ -155,6 +162,7 @@ def append_event(
         created_at=created_at,
         prev_hash=prev_hash,
         hash=GENESIS_PREV_HASH,  # placeholder; updated below
+        user_id=event.user_id,
     )
     session.add(row)
     session.flush()  # populate row.id

backend/src/cyclone/db.py

@@ -669,6 +669,11 @@ class AuditLog(Base):
     created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), nullable=False)
     prev_hash: Mapped[str] = mapped_column(String(64), nullable=False)
     hash: Mapped[str] = mapped_column(String(64), nullable=False)
+    # SP-auth: which authenticated user performed this action. Nullable
+    # so existing (pre-auth) rows and system-initiated events stay valid.
+    # NOT part of the hash chain — verify_chain must continue to work on
+    # legacy rows that pre-date this column.
+    user_id: Mapped[Optional[int]] = mapped_column(Integer, nullable=True, index=True)
 
     __table_args__ = (
         Index("idx_audit_log_entity", "entity_type", "entity_id"),