fix(state): guard the duplicate-title repair so it can never abort DB open

Follow-up to the salvaged #65636: if the dedup UPDATE or the retried
CREATE INDEX raises, log and continue — the unique title index is an
optimization and must not block SessionDB initialization.

hermes_state.py

@@ -1787,6 +1787,9 @@ class SessionDB:
         try:
             cursor.execute(title_index_sql)
         except sqlite3.IntegrityError:
+            # The index is an optimization — its creation must never abort
+            # opening the database, so the repair itself is also guarded.
+            try:
                 cursor.execute(
                     """UPDATE sessions AS older
                        SET title = NULL
@@ -1802,6 +1805,11 @@ class SessionDB:
                     cursor.rowcount,
                 )
                 cursor.execute(title_index_sql)
+            except sqlite3.Error:
+                logger.exception(
+                    "Could not repair duplicate session titles; "
+                    "unique title index not created"
+                )
         except sqlite3.OperationalError:
             pass  # Index already exists