01f7ce5b76
POST /api/sessions/owner-backfill stamps a store's own serving-profile identity onto its pre-#95407 'profile_name = NULL' session rows. Single match by construction (each profile's state.db belongs to exactly one profile), idempotent, one-shot-per-row, never overwrites a non-NULL owner, and reports the stamped count for logging. Refs #94724