* feat: webhooks
* feat: Enhance webhook security and typing, fix validation and encryption bugs
* fix: lint / types
* fix: rm files
* fix: rm mcp
* fix: pydantic issue with TypedDict in python version <= 3.11
* fix: pre-commit hook for test coverage
* fix: simplify API -- store url on workspace
* fix: redo architecture
* fix: webhook body
* fix: make workspace optional
* fix: comments
* refactor: add webhook secret
* fix: CR comments
* feat: use deriver for webhooks
* use key-value approach
* feat: add work unit key to deriver
* fix: add work unit key to webhooks
* fix: tests
* fix: cr comments #2
* fix: endpoint structure; make webhook delivery into a function; add tests; other general comments
* chore: change webhook secret, fix test event and workspace_id, use async with
* feat: implement queue.empty and backfill
* fix: unique constraint
* refactor: queue to use outerjoin and remove skip locked; also fix publish queue.empty
* fix: tests
* fix: migration - make columns non-nullable
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