[Feat] Valkey vector store implementation

[daric93]

Closes #1611

Summary

Adds Valkey as a vector store backend using the valkey-search module, enabling the system to run entirely on Valkey (when memory is disabled).

Implementation

• ValkeyBackend struct implements the VectorStoreBackend interface (CreateCollection, DeleteCollection, CollectionExists, InsertChunks, DeleteByFileID, Search, Close)
• Uses valkey-glide Go client with CustomCommand for all FT.* search operations (FT.CREATE, FT.SEARCH, FT.DROPINDEX, FT.INFO)
• Coexists with existing vector store backends (memory, milvus, llama_stack) via the factory in factory.go

Validation

• Added unit and integration tests.
• Added CI configuration to run integration tests against a Valkey instance with the valkey-search module.
• Tested locally with make test-valkey-vectorstore-external and make run-valkey-example-external.

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[github-actions]

🚨 Supply Chain Security Report — Issues Found

Scanner	Status	Findings
AST Codebase Scan (Py, Go, JS/TS, Rust)	🚨	No issues detected
AST PR Diff Scan	🚨	No issues detected
Regex Fallback Scan	✅	No issues detected

Action required: CRITICAL and HIGH severity findings must be resolved before merge.

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Scanned at 2026-03-27T00:49:03.718Z · View full workflow logs