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One-time migration from the old Python/Flask Tanabata DB into the new core/data/acl/activity schema. - transform.sql: reads a `legacy` schema and writes the new one in a single, idempotent transaction. Remaps user/mime ids (uuid -> smallint by name), inverts is_private -> is_public, lifts EXIF out of files.metadata into the exif column, preserves pool hierarchy/created under metadata, synthesises file_pool ordering, derives acl object types, sanitises colors/notes. - migrate.sh: links the new DB to the old one via postgres_fdw, imports the old public schema as `legacy`, runs the transform, tears the link down. - README.md: mapping table, decisions/lossy points, and the separate physical-blob copy step. - docs/reference/schema.sql: the old DB schema the migration is built from (referenced by the README). Verified end-to-end on PostgreSQL 16 (synthetic legacy data, all transformations and idempotency checked). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>