Make the fused Phase-1 ACR schema concrete with DDL samples
Constraint: Keep the storage design aligned to the current song-centric model while turning the 4-table fused schema into something engineers can directly review and implement. Rejected: Keep only conceptual docs without concrete SQL | It leaves too much ambiguity about where slices, models, and features actually land. Confidence: high Scope-risk: narrow Directive: Until the repository gains a production SQL file for the fused model, treat postgres_db_schema_samples.md as the authoritative DDL draft for media_entity/audio_object/feature_fact/set_membership. Tested: git diff --check on touched files; /usr/local/miniconda3/bin/python scripts/check_markdown_links.py --root docs returned OK for 11 active markdown files Not-tested: Executing the fused DDL against a live PostgreSQL schema
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