REPO_POLICIES.md puts migrations in internal/db/migrations/ as
000_migration.sql and 001_schema.sql. The two files move there with
their contents unchanged. go:embed cannot reach outside its own
package, so internal/db/migrations has a small package that embeds
them, and internal/database reads them through its FS(). The database
package stays where CONVENTIONS.md puts it; moving it would change
existing test files in other packages.
The version still comes from the filename prefix, so a database that
has recorded versions 0 and 1 runs neither again. A new test applies
the migrations twice to one database file and checks that the second
run applies nothing.
Model: opus-5-5
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