Fix(connector): expose id_column, timestamp_column, metadata_columns for MySQL/PostgreSQL incremental sync

[buildearth]

What problem does this PR solve?

The MySQL and PostgreSQL sync classes in sync_data_source.py were not
passing id_column, timestamp_column, and metadata_columns to RDBMSConnector,
making incremental sync and document update impossible even when configured.

• Without id_column: updated records generate new documents instead of
  overwriting existing ones (doc ID is derived from content hash, so any
  change produces a new ID).
• Without timestamp_column: poll_source always falls back to full sync,
  ignoring the configured time range.
• The three fields existed in the frontend default values but had no form
  inputs, so users had no way to fill them in.

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)

Changes

• Backend (rag/svr/sync_data_source.py): pass id_column,
  timestamp_column, and metadata_columns from self.conf to
  RDBMSConnector for both MySQL and PostgreSQL sync classes.
• Frontend (web/src/pages/user-setting/data-source/constant/index.tsx):
  add ID Column, Timestamp Column, and Metadata Columns form fields
  to MySQL and PostgreSQL data source configuration UI with tooltips.

[Copilot]

Pull request overview

This PR fixes MySQL/PostgreSQL incremental sync configuration wiring by exposing id_column, timestamp_column, and metadata_columns end-to-end (UI → sync classes → RDBMSConnector), enabling stable document IDs, incremental polling, and metadata extraction when configured.

Changes:

• Backend: pass metadata_columns, id_column, and timestamp_column from sync config into RDBMSConnector for MySQL and PostgreSQL.
• Frontend: add form inputs (with tooltips) for Metadata Columns, ID Column, and Timestamp Column for MySQL/PostgreSQL data sources.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
web/src/pages/user-setting/data-source/constant/index.tsx	Adds MySQL/PostgreSQL form fields to let users configure ID/timestamp/metadata columns.
rag/svr/sync_data_source.py	For MySQL/PostgreSQL sync, forwards the new config fields into RDBMSConnector to enable incremental sync and stable IDs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.72%. Comparing base (cdbbd26) to head (05e0b81).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

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  Coverage   96.72%   96.72%           
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  Files          10       10           
  Lines         702      703    +1     
  Branches      112      112           
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+ Hits          679      680    +1     
  Misses          5        5           
  Partials       18       18           

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[Magicbook1108]

@MkDev11 Hello can you help with this？

[MkDev11]

Sure