chore(scripts): add legacy data migration

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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>

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This commit is contained in:

Masahiko AMANO

2026-06-11 12:42:06 +03:00

parent 437b66e73a

commit 76942721ad

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docs/reference/schema.sql

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