3.6.19 - This release sucks in the best way possible

This release introduces an optional database vacuum service that periodically deletes old flow runs and orphaned resources (logs, artifacts, artifact collections) to keep your database lean. It's disabled by default — enable it with PREFECT_SERVER_SERVICES_DB_VACUUM_ENABLED=true. Once enabled, it runs hourly and removes terminal top-level flow runs older than 90 days. Both the retention period and frequency are configurable via PREFECT_SERVER_SERVICES_DB_VACUUM_RETENTION_PERIOD (in seconds, minimum 1 hour) and PREFECT_SERVER_SERVICES_DB_VACUUM_LOOP_SECONDS.

Enhancements ➕➕

• Add DB vacuum service in Docket by @tom21100227 in #20746
• Add Docker images for prefect-gcp and prefect-azure by @devin-ai-integration[bot] in #20771

Bug Fixes 🐞

• Add SSRF protection to CustomWebhookNotificationBlock by @devin-ai-integration[bot] in #20781
• Fix scheduler to check per-schedule run counts for multi-schedule deployments by @devin-ai-integration[bot] in #20699
• Fix FastAPI 0.132.0 compatibility by @devin-ai-integration[bot] in #20822

Development & Tidiness 🧹

• Add UI v2 unit tests and E2E tests to Devin flaky test workflow by @devin-ai-integration[bot] in #20774
• Migrate work-pool command to cyclopts by @zzstoatzz in #20766
• Migrate transfer command to cyclopts by @zzstoatzz in #20767
• Migrate cloud command to cyclopts by @zzstoatzz in #20780
• Migrate deploy command to cyclopts by @zzstoatzz in #20783
• Remove bogus alias from cyclopts deployment command by @zzstoatzz in #20793
• Add deploy to cyclopts routing and remove dead delegation code by @zzstoatzz in #20794
• Migrate automation command to cyclopts and register init at root level by @zzstoatzz in #20802
• Split database and orchestration tests into separate jobs by @desertaxle in #20803
• Clean up cyclopts phase 2 — server status, stdin handling, watch monkeypatch by @devin-ai-integration[bot] in #20807

Documentation 📓

• Add ImportString section to form-building guide by @zzstoatzz in #20768
• Fix MDX rendering issues in prefect-databricks API reference docs by @desertaxle in #20792

Full Changelog: 3.6.18...3.6.19