fix(ci): simplify self-host setup and database initialization

[izadoesdev]

Self-host installs can initialize schemas and build a dashboard for their own URLs using Docker Compose alone. The init image ships with releases; run --rm init starts its database dependencies and applies PostgreSQL/ClickHouse setup. Insights is opt-in, so the default stack needs no AI credentials.

Compose shares database, auth, and health-check settings and removes fixed container names, the custom network, and unused IP_HASH_SALT. It adds dashboard and init services while removing 14 lines overall. Existing database credentials, volumes, and hosted Docker defaults remain unchanged. Email and optional provider settings reach the services that use them.

Validation

• Lint, 33 typecheck tasks, and 27 root test tasks pass.
• Docker smoke covers fresh initialization, repeat setup, and invalid database credentials; CI runs the same check. The shorter startup sequence passes, and the cleanup resolves to identical services, volumes, and networks.
• Combined with fix(api): honor self-hosted email sender settings #803, fix(basket): allow self-hosted ingestion without hosted billing #805, and fix(dashboard): support custom-domain self-host onboarding #806: all seven default containers were healthy; browser signup, login, website creation, ingestion, and analytics display passed without email, Autumn, AI, or Kafka credentials. Custom CSP and omitted self-host tracking scripts were verified.
• Independent reviews found no blocking issues. Disposable test resources were removed. The earlier status-preview Bun crash passed on a preview-only retry.

Dependencies and limits

Depends on #803, #805, and #806 for email fallback, credential-free ingestion, and custom-domain onboarding. All branches start from staging. This PR owns Compose and schema setup; #808 owns the README and contributor guidance so the diffs do not overlap.

Billing-backed features still need Autumn; missing-provider billing errors overlap #790. DQL needs restricted-user provisioning. Upgrades require matching release checkouts, explicit PostgreSQL prompts, and release-specific ClickHouse migrations.

AI-assisted implementation and verification with Codex. Draft for maintainer review; no production deployment performed.

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Project	Deployment	Actions	Updated
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databuddy-status	Ready	Preview	Sep 16, 2026 6:09am UTC
documentation	Ready	Preview	Sep 16, 2026 6:09am UTC

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