build(db): add Alembic scaffolding + baseline migration

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Introduce Alembic at v1. Migrations live inside the package
(decnet/web/db/migrations) so they ship with installs; alembic.ini at the
repo root drives the CLI. env.py is async and dual-backend, selecting the
engine from DECNET_DB_TYPE (mirroring db/factory.py) and reusing the app's
own connection when run programmatically.

The baseline captures all 39 tables. _BIG_TEXT round-trips as
Text().with_variant(MEDIUMTEXT, 'mysql'), so both backends get the right
column type from the migration. kd_digraph_simhash gains a sqlite BLOB
variant: BINARY(8) reflects as NUMERIC on SQLite and would otherwise trip
'alembic check' forever.

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anti

2026-06-16 16:30:29 -04:00

parent 4f141c1a54

commit ef4d67cbef

8 changed files with 1392 additions and 3 deletions

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decnet/web/db/migrations/versions/4a914b1d62a0_baseline_schema.py Normal file

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