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docs: add unified_database_system integration layer guide#359

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kcenon merged 2 commits into
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docs/issue-355-document-unified-database-system
Feb 8, 2026
Merged

docs: add unified_database_system integration layer guide#359
kcenon merged 2 commits into
mainfrom
docs/issue-355-document-unified-database-system

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@kcenon kcenon commented Feb 8, 2026 •
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Summary

  • Add comprehensive docs/guides/UNIFIED_SYSTEM.md (~1200 lines) covering the unified database system integration layer
  • Update docs/API_REFERENCE.md with Unified Database System section and cross-references

What's Documented

Architecture

  • System layers diagram showing component relationships
  • Component dependency graph (unified_db_config → coordinator → adapters)

Configuration (configuration.h)

  • unified_db_config with full builder API reference (14 builder methods)
  • All 5 sub-configuration structs: database_config, pool_config, db_logger_config, db_monitoring_config, db_thread_config
  • All enums: backend_type, db_log_level, thread_pool_type
  • Integration flags for external system integration

Connection String Builder

  • Fluent API for type-safe connection string construction
  • Backend-specific output formats (PostgreSQL, MySQL, SQLite, MongoDB, Redis)
  • SSL mode configuration

Database Coordinator

  • Initialization sequence (Logger → Monitoring → Thread) with rollback on failure
  • Shutdown sequence (reverse order)
  • Health check aggregation and coordinator statistics

Integration Adapters

  • Logger Adapter: Backend selection (system/fallback/null), query sanitization, slow query detection, file rotation
  • Monitoring Adapter: Connection pool metrics, query performance tracking, Prometheus export, database_metrics struct
  • Thread Adapter: SubmittableTask concept, fire-and-forget execution, future-based submission

Protocol Layer

  • Binary message format (20-byte header with magic 0xDB01DB01 + request_id)
  • Message types (connection, query, transaction, prepared, error)
  • Protocol serializer API
  • Optional container_system integration

Examples

  • Zero-config quick start
  • Production configuration with full adapter lifecycle
  • Async operations with monitoring
  • Connection string builder usage for multiple backends

Configuration Defaults Reference

  • Complete table of all default values across all subsystems

Limitations

  • PostgreSQL-only backend support in current implementation
  • Coordinator Phase 6 connection pool integration pending
  • EMA-based latency tracking limitations

Test Plan

  • Markdown renders correctly (headings, tables, code blocks, diagrams)
  • All cross-document links resolve (API_REFERENCE.md, ARCHITECTURE.md, PROXY_LAYER.md, ORM_GUIDE.md)
  • Code examples match actual source API signatures — fixed in 066f9fb
  • Configuration defaults match source code values (56/56 verified)
  • Build succeeds with no regressions

Closes #355

@kcenon
docs: add unified_database_system integration layer guide (#355)
aa041ad 
Add comprehensive documentation for the unified database system
covering architecture, configuration, adapters, protocol layer,
and connection string builder. Update API_REFERENCE.md with
cross-references to the new guide.
@kcenon kcenon mentioned this pull request Feb 8, 2026
Closed
6 tasks
@kcenon
fix(docs): correct protocol header, message types, and API signatures
066f9fb 
- Fix message_header: 20 bytes (not 12), add missing request_id field
- Fix message_type enum: use actual names (DISCONNECT, BEGIN_TRANSACTION,
  PREPARE_STATEMENT, CLOSE_PREPARED, PING/PONG) and correct values
- Fix unified_database_system API: show builder pattern (create_builder),
  correct Result<T> return types, fix all 3 affected examples
@kcenon kcenon merged commit 878c181 into main Feb 8, 2026
23 checks passed
@kcenon kcenon deleted the docs/issue-355-document-unified-database-system branch February 8, 2026 15:53
kcenon added a commit that referenced this pull request Apr 13, 2026
@kcenon
docs: add unified_database_system integration layer guide (#359)
68ea089 
* docs: add unified_database_system integration layer guide (#355)

Add comprehensive documentation for the unified database system
covering architecture, configuration, adapters, protocol layer,
and connection string builder. Update API_REFERENCE.md with
cross-references to the new guide.

* fix(docs): correct protocol header, message types, and API signatures

- Fix message_header: 20 bytes (not 12), add missing request_id field
- Fix message_type enum: use actual names (DISCONNECT, BEGIN_TRANSACTION,
  PREPARE_STATEMENT, CLOSE_PREPARED, PING/PONG) and correct values
- Fix unified_database_system API: show builder pattern (create_builder),
  correct Result<T> return types, fix all 3 affected examples
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[Task] docs: Document unified_database_system integration layer

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@kcenon