Both roles derived `..._appservice_database_uri` as `'sqlite:///' + <path>`.
mautrix-go hands that string to go-sqlite3 as a filename rather than parsing it
as a URL, so the bridge cannot open its database and dies at startup:

  FTL Failed to initialize database
      error="... unable to open database file: no such file or directory"

Every other mautrix bridge role here passes the bare in-container path.

This has stayed hidden because group_vars/matrix_servers selects postgres
whenever postgres is enabled, which is the default - so almost nobody reaches
the sqlite branch. Anyone who does gets a bridge that never starts.

Found by the mautrix-meta-messenger Molecule scenario, which runs sqlite
deliberately. The scenario's override is dropped and its assertion now compares
the rendered URI against the path the role defines, so the derived value is
what is under test rather than the scenario's own.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SEH3vxYSQ5SV4N5z61eyGT