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 48.11%. Comparing base (7bbe10c) to head (ec1064f).

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     74.44%   48.11%   -26.33%     
  Complexity      943      943               
=============================================
  Files          1231     1235        +4     
  Lines        120911   107676    -13235     
  Branches      97647    84440    -13207     
=============================================
- Hits          90017    51813    -38204     
- Misses        27943    53043    +25100     
+ Partials       2951     2820      -131     

Components	Coverage Δ
Rust Core	41.83% <82.56%> (-33.76%)	⬇️
Java SDK	58.44% <ø> (ø)
C# SDK	69.41% <ø> (-0.52%)	⬇️
Python SDK	81.06% <ø> (ø)
Node SDK	91.44% <ø> (-0.10%)	⬇️
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 351 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