a0470b5f60
_apply_sidecar is additive: it find-or-creates Post/Source/ImageProvenance and sets primary_post_id NULL-only, so any IR-migration provenance on the existing row survives untouched and the new GS sidecar adds a second ImageProvenance pointing at the freshly-created Post. Wrapped in try/except so a malformed sidecar can't unwind the file-swap commit — the file replacement is the critical operation. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>