psycopg2 performs %-substitution when params are passed to execute(),
so 'M%' in the LIKE clause was being interpreted as a positional
placeholder, raising IndexError when there's only one real %s (LIMIT).
Escape as 'M%%' so it's preserved as a literal percent.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Read-only script that samples B1 global masters from master_assets and
reports: top-level keys in full_metadata, presence of
metadata.metadata_element_list, and any element_ids matching
creativex/cx/score/quality (case-insensitive). Helps diagnose why the CX
backfill found 0 matches — distinguishes "client masters have no CX
score yet" from "CX field uses a different element_id than A1".
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
