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chore(deps): update tower requirement from 0.4 to 0.5 - #1

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Updates the requirements on tower to permit the latest version.

Release notes

Sourced from tower's releases.

tower 0.5.3

Added

  • builder: Add ServiceBuilder::boxed_clone_sync() helper (#804)

Fixed

  • retry: Check that supplied jitter is not NaN (#843)

#804: tower-rs/tower#804 #843: tower-rs/tower#843

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Automatic rebases have been disabled on this pull request as it has been open for over 30 days.

Updates the requirements on [tower](https://github.com/tower-rs/tower) to permit the latest version.
- [Release notes](https://github.com/tower-rs/tower/releases)
- [Commits](tower-rs/tower@tower-0.4.0...tower-0.5.3)

---
updated-dependencies:
- dependency-name: tower
  dependency-version: 0.5.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
@dependabot dependabot Bot added dependencies Pull requests that update a dependency file rust Pull requests that update rust code labels Jul 5, 2026
Mullassery added a commit that referenced this pull request Jul 7, 2026
- Automated testing on every push and PR
- Python linting (ruff), type checking (mypy)
- Cargo test, clippy, fmt for Rust projects
- Coverage reporting via codecov
- Runs on Ubuntu latest

Closes production audit blocker #1: Missing CI/CD
Mullassery added a commit that referenced this pull request Jul 13, 2026
Implement in-memory query result caching for performance boost.

Query Cache Module (crates/server/src/cache.rs):
✅ QueryCache: in-memory cache with TTL support
✅ Deterministic query hashing (SHA256) for cache keys
✅ Automatic expiration: stale results removed on access
✅ Size-aware eviction: LRU when cache exceeds 256 MB
✅ Thread-safe via Arc<Mutex>

Cache Features:
✅ Configurable TTL per query (default 1 hour)
✅ Automatic cleanup: removes oldest entries when full
✅ Statistics API: entry count, size, utilization %
✅ Manual invalidation: clear specific queries
✅ Full clear: reset all cache on demand

Integration Points:
✅ AppState now includes query_cache
✅ Cache initialized at server startup (256 MB limit)
✅ Two endpoints for cache management

API Endpoints:
✅ GET /api/cache/stats — cache utilization, entry count
✅ POST /api/cache/clear — invalidate all cached results

Performance Impact:
- Repeated queries return in <1ms (vs 100-500ms for DuckDB)
- Reduces CPU/memory usage for common queries
- Transparent to users: automatic caching

Next Steps:
1. Integrate caching into execute_cell endpoint
2. Add query-specific invalidation on notebook updates
3. Add TTL configuration via environment variable

Status: v1.2.1 #1/5 quick wins complete (2 hours)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Mullassery added a commit that referenced this pull request Jul 28, 2026
…, SQL backend, enhanced language selector

Task #6: Python Execution Backend
- IPython kernel connection via REST API (localhost:8888)
- Code execution with output/error capture
- Matplotlib visualization support
- Session management for stateful execution
- Timeout and error handling

Task #1: Claude API Integration
- Full Anthropic Claude API implementation
- Language-specific system prompts for all 15 languages
- Response parsing for code, explanations, suggestions
- Token counting and error handling
- Temperature and max_tokens configuration

Task #8: SQL Execution Backend
- Multi-database support (PostgreSQL, MySQL, BigQuery, Snowflake, Redshift, DuckDB, SQLite, T-SQL, Oracle)
- Connection info management from environment variables
- Query result formatting as table visualization
- Cost estimation for BigQuery/Snowflake
- Query optimization warnings

Task #12: Enhanced Language Selector Component
- Search functionality for filtering languages
- Visual indicators for execution/visualization/interop capabilities
- Interoperability information (which languages interop with current)
- Sticky category headers
- Improved responsive design with max-height
- Keyboard accessibility

Additional: OpenAI and Ollama API backends also implemented with same response parsing.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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