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Complete backend design for an Arma 3 dedicated server management panel: - ARCHITECTURE.md: System architecture, tech stack, component responsibilities, data flows - DATABASE.md: SQLite schema with WAL mode, CHECK constraints, 16+ tables - API.md: REST + WebSocket API contract with auth, CRUD, and real-time channels - MODULES.md: Python module breakdown with class definitions and dependencies - THREADING.md: Concurrency model with thread safety, auto-restart, and WS bridge - IMPLEMENTATION_PLAN.md: 7-phase implementation plan with security from Phase 1 Key design decisions: - Sync SQLAlchemy only (no aiosqlite), thread-local DB connections - Structured config builder (not f-strings) preventing config injection - RCon request multiplexer for concurrent UDP access - BackgroundScheduler for sync DB cleanup jobs - ban.txt bidirectional sync with documented field mapping - Auto-restart sequenced after thread cleanup Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>