fix(email): scope learned sender signatures by owner (#3724)

src/builtin_actions.py

@@ -809,14 +809,14 @@ async def action_learn_sender_signatures(owner: str, **kwargs) -> Tuple[str, boo
         import email as _email_mod
         import asyncio as _aio
         from datetime import datetime as _dt, timedelta as _td
-        from routes.email_helpers import _imap_connect, SCHEDULED_DB
+        from routes.email_helpers import _email_cache_owner_clause, _imap_connect, SCHEDULED_DB
         from src.endpoint_resolver import resolve_endpoint
         from src.llm_core import llm_call_async
 
         # 1. Pull recent UIDs + From headers cheaply (header-only fetch).
         def _pull_headers():
             results = []
-            conn = _imap_connect(None)
+            conn = _imap_connect(None, owner=owner)
             try:
                 conn.select("INBOX", readonly=True)
                 status, data = conn.search(None, "ALL")
@@ -868,9 +868,11 @@ async def action_learn_sender_signatures(owner: str, **kwargs) -> Tuple[str, boo
         # 3. Eligibility: ≥3 emails AND (no cache OR cache > 30 days old).
         try:
             conn = _sql3.connect(SCHEDULED_DB)
+            owner_clause, owner_params = _email_cache_owner_clause(owner)
             cached = {
                 r[0]: r[1] for r in conn.execute(
-                    "SELECT from_address, last_built_at FROM sender_signatures"
+                    f"SELECT from_address, last_built_at FROM sender_signatures WHERE {owner_clause}",
+                    owner_params,
                 ).fetchall()
             }
             conn.close()
@@ -901,7 +903,7 @@ async def action_learn_sender_signatures(owner: str, **kwargs) -> Tuple[str, boo
 
             def _fetch_bodies(_msgs):
                 bodies = []
-                conn2 = _imap_connect(None)
+                conn2 = _imap_connect(None, owner=owner)
                 try:
                     conn2.select("INBOX", readonly=True)
                     for mm in _msgs:
@@ -978,11 +980,12 @@ async def action_learn_sender_signatures(owner: str, **kwargs) -> Tuple[str, boo
 
             try:
                 conn = _sql3.connect(SCHEDULED_DB)
+                owner_value = (owner or "").strip()
                 conn.execute(
                     "INSERT OR REPLACE INTO sender_signatures "
-                    "(from_address, signature_text, sample_count, last_built_at, model_used, source) "
-                    "VALUES (?, ?, ?, ?, ?, ?)",
-                    (addr, cached_sig, len(bodies), _dt.utcnow().isoformat(), model, "llm"),
+                    "(from_address, owner, signature_text, sample_count, last_built_at, model_used, source) "
+                    "VALUES (?, ?, ?, ?, ?, ?, ?)",
+                    (addr, owner_value, cached_sig, len(bodies), _dt.utcnow().isoformat(), model, "llm"),
                 )
                 conn.commit()
                 conn.close()