Add last updated timestamp to feedback

[zhenghaoz]

No description provided.

[Copilot]

Pull request overview

This pull request adds an Updated timestamp field to feedback records across the entire codebase to track when feedback was last modified, complementing the existing Timestamp field that tracks the initial creation time.

Key Changes:

• Added Updated field to the Feedback struct and database schemas across all supported databases (MySQL, PostgreSQL, SQLite, ClickHouse, MongoDB)
• Implemented proper aggregation logic: Timestamp uses MIN/LEAST (earliest), Updated uses MAX/GREATEST (latest)
• Updated protocol buffer definitions and regenerated code with newer protoc versions (v6.33.1)

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
storage/data/database.go	Added Updated field to the core Feedback struct definition
storage/data/sql.go	Added Updated column to all SQL database schemas (MySQL, PostgreSQL, SQLite, ClickHouse) with appropriate aggregation functions and query updates
storage/data/mongodb.go	Added Updated field handling with $max operator for MongoDB upsert operations
storage/data/proxy.go	Updated proxy server and client to include Updated field in protobuf conversions
storage/data/database_test.go	Updated test expectations to include Updated field and restructured feedback initialization to use explicit field names
server/rest_test.go	Updated REST API test expectations to include Updated field in JSON responses
protocol/protocol.proto	Added updated field (field number 8) to the Feedback message
protocol/protocol.pb.go	Regenerated with protoc-gen-go v1.36.10 and protoc v6.33.1, includes structural improvements
protocol/protocol_grpc.pb.go	Regenerated with protoc-gen-go-grpc v1.6.0, includes typo fixes
protocol/data_store.pb.go	Regenerated with updated protoc version v6.33.1
protocol/data_store_grpc.pb.go	Regenerated with protoc-gen-go-grpc v1.6.0, includes typo fixes
protocol/cache_store.pb.go	Regenerated with updated protoc version v6.33.1
protocol/cache_store_grpc.pb.go	Regenerated with protoc-gen-go-grpc v1.6.0, includes typo fixes
protocol/encoding.pb.go	Regenerated with protoc-gen-go v1.36.10 and protoc v6.33.1

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.60%. Comparing base (fec9318) to head (c434361).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1114      +/-   ##
==========================================
+ Coverage   71.55%   71.60%   +0.04%     
==========================================
  Files          85       85              
  Lines       14983    15009      +26     
==========================================
+ Hits        10721    10747      +26     
  Misses       3204     3204              
  Partials     1058     1058              

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