Helper reduction:
- Move the Django DATABASES/SQLITE_CONNECTION_OPTIONS assembly into
core/settings.py, dropping get_database_settings() and
get_sqlite_connection_options() from misc/db.py.
- Inline the single-use migration_table_columns() into its one migration.
Review fixes:
- search: match only scalar JSON *values* on postgres (jsonb_path_query
over '$.**' scalar leaves), mirroring SQLite json_tree.atom so config
keys no longer match.
- CharField clamp now also runs in SnapshotQuerySet.bulk_create (bulk paths
bypass the pre_save signal); truncate_overlong_charfields is dual-use.
- Restore reverse-migration parity on postgres: crawls/machine/api initial
migrations drop their rebuilt tables on reverse via drop_models_on_postgres.
- docs: give DATABASE_NAME its own section so the anchor resolves correctly.
- CI: only install postgres binaries on the shard that runs the postgres test.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019YHSjZM6TstSAMN2PhgfUg
Add DATABASE_ENGINE=postgres (plus DATABASE_HOST/PORT/USER/PASSWORD/NAME)
config and centralize all sqlite-vs-postgres branching in
archivebox.misc.db:
- get_database_settings() builds DATABASES for either backend; the sqlite
path is unchanged (custom lock-retry backend, same PRAGMAs).
- database_exists()/ensure_database_ready() replace index.sqlite3 file
checks; init auto-creates the postgres database when missing.
- approximate_row_counts() serves admin index counts from sqlite_stat1 or
pg_class.reltuples; missing-table detection covers both vendors.
- rebuild_models_from_migration_state() lets historical sqlite-only raw
SQL migrations resync postgres schema from Django migration state at
every divergence point (postgres can never hold legacy data, so
affected tables are empty when these run). All raw-DDL and PRAGMA
migrations are now vendor-gated with sqlite behavior byte-for-byte
unchanged.
- A pre_save clamp truncates CharField values to max_length: sqlite
never enforced varchar(n) but postgres does (e.g. long crawl labels).
- Collation-sensitive URL range scans branch to escaped LIKE on postgres
(with a text_pattern_ops index) since linguistic collations break
bytewise range tricks; the crawl-config JSON search wave gets a
jsonb-text implementation.
Verified on real PostgreSQL 16: fresh init applies the entire migration
graph, schema matches models exactly (column-level parity check +
makemigrations --check), and add/run/list/search/status/remove all work
end-to-end. New test_postgres_backend.py suite boots a real throwaway
postgres cluster (initdb + pg_ctl); CI workflows install postgres server
binaries.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019YHSjZM6TstSAMN2PhgfUg
