Pg 4 (#2390)

* feat: postgres tests

* feat: mongo cutoff

* feat: mongo cutoff

* feat: adjust docs and compose files

* fix: mini code mongo removals

* fix: tests and k8s mongo stuff

* feat: test fixes

* fix: ruff

* fix: vale

* Potential fix for pull request finding 'CodeQL / Clear-text logging of sensitive information'

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* fix: mini suggestions

* vale lint fix 2

* fix: codeql columns thing

* fix: test mongo

* fix: tests coverage

* feat: better tests 4

* feat: more tests

* feat: decent coverage

* fix: ruff fixes

* fix: remove mongo mock

* feat: enhance workflow engine and API routes; add document retrieval and source handling

* feat: e2e tests

* fix: mcp, mongo and more

* fix: mini codeql warning

* fix: agent chunk view

* fix: mini issues

* fix: more pg fixes

* feat: postgres prep on start

* feat: qa tests

* fix: mini improvements

* fix: tests

---------

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Co-authored-by: Siddhant Rai <siddhant.rai.5686@gmail.com>

docs/content/Guides/ocr.mdx

@@ -31,7 +31,7 @@ DOCLING_OCR_ATTACHMENTS_ENABLED=false
 ### Attachment flow (Chat-only file context)
 
 1. Files are uploaded through `/api/store_attachment`.
-2. Celery task `attachment_worker` parses and stores the attachment in MongoDB (`attachments` collection).
+2. Celery task `attachment_worker` parses and stores the attachment in Postgres (`attachments` table).
 3. OCR in this path is controlled by `DOCLING_OCR_ATTACHMENTS_ENABLED`.
 4. Attachments are not vectorized and are not added to the source index.
 5. During answer generation, selected attachment IDs are loaded and passed directly to the LLM pipeline.