feat(connectors): Clickhouse Sink Connector

[kriti-sc]

Which issue does this PR close?

Closes #2539

Rationale

Clickhouse is a real-time data analytics engine, and very popular in modern analytics architectures.

What changed?

This PR introduces a Clickhouse Sink Connector that enables writing data from Iggy to Clickhouse.

The Clickhouse writing logic is heavily inspired by the official Clickhouse Kafka Connector.

Local Execution

• Produced messages 30456 + 29060 rows with schema user_id: String, user_type: u8, email: String, source: String, state: String, created_at: DateTime, message: String using sample data producer.
• Consumed messages using the Clickhouse sink and into the particular Clickhouse table.
• Verified schema and number of rows in Clickhouse.
• Added unit tests and e2e tests, both passing.

Images 1&2: Produced 30456 + 29060 rows into Iggy in two batches
Image 3: Verified schema and number of rows in Clickhouse

AI Usage

1. Which tools? (e.g., GitHub Copilot, Claude, ChatGPT) Claude Code
2. Scope of usage? (e.g., autocomplete, generated functions, entire implementation) generated functions
3. How did you verify the generated code works correctly? Manual testing by producing data into Iggy and then running the sink and verifying insertion into Clickhouse, unit tests and e2e tests for different Clickhouse insert configurations.
4. Can you explain every line of the code if asked? Yes

[codecov]

Codecov Report

❌ Patch coverage is 82.56210% with 358 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.10%. Comparing base (d254604) to head (bc7ce0a).
⚠️ Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
...ore/connectors/sinks/clickhouse_sink/src/binary.rs	82.95%	122 Missing and 56 partials ⚠️
...ore/connectors/sinks/clickhouse_sink/src/schema.rs	76.45%	30 Missing and 75 partials ⚠️
...ore/connectors/sinks/clickhouse_sink/src/client.rs	72.68%	55 Missing and 10 partials ⚠️
core/connectors/sinks/clickhouse_sink/src/lib.rs	97.27%	3 Missing and 1 partial ⚠️
core/connectors/sinks/clickhouse_sink/src/sink.rs	60.00%	4 Missing ⚠️
core/connectors/sinks/clickhouse_sink/src/body.rs	98.80%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             master    #2886       +/-   ##
=============================================
- Coverage     74.43%   48.10%   -26.34%     
  Complexity      943      943               
=============================================
  Files          1245     1249        +4     
  Lines        121293   108413    -12880     
  Branches      97599    84748    -12851     
=============================================
- Hits          90285    52149    -38136     
- Misses        28054    53445    +25391     
+ Partials       2954     2819      -135     

Components	Coverage Δ
Rust Core	41.69% <82.56%> (-33.88%)	⬇️
Java SDK	58.44% <ø> (ø)
C# SDK	69.44% <ø> (-0.48%)	⬇️
Python SDK	81.06% <ø> (ø)
PHP SDK	83.57% <ø> (ø)
Node SDK	91.22% <ø> (-0.13%)	⬇️
Go SDK	40.20% <ø> (ø)

Files with missing lines	Coverage Δ
core/connectors/sinks/clickhouse_sink/src/body.rs	98.80% <98.80%> (ø)
core/connectors/sinks/clickhouse_sink/src/lib.rs	97.27% <97.27%> (ø)
core/connectors/sinks/clickhouse_sink/src/sink.rs	60.00% <60.00%> (ø)
...ore/connectors/sinks/clickhouse_sink/src/client.rs	72.68% <72.68%> (ø)
...ore/connectors/sinks/clickhouse_sink/src/schema.rs	76.45% <76.45%> (ø)
...ore/connectors/sinks/clickhouse_sink/src/binary.rs	82.95% <82.95%> (ø)

... and 350 files with indirect coverage changes

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[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

[hubcio]

overall good direction, just needs a little bit polishing

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

[github-actions]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed in 7 days if no further activity occurs.

If you need a review, please ensure CI is green and the PR is rebased on the latest master. Don't hesitate to ping the maintainers - either @core on Discord or by mentioning them directly here on the PR.

Thank you for your contribution!

[kriti-sc]

/ready