# Architecture Decision Records (ADRs)

This directory contains Architecture Decision Records (ADRs) for the dance-lessons-coach project.

## Index of ADRs

| Number | Title | Status |
|--------|-------|--------|
| 0001 | Go 1.26.1 Standard | ✅ Accepted |
| 0002 | Chi Router | ✅ Accepted |
| 0003 | Zerolog Logging | ✅ Accepted |
| 0004 | Interface-Based Design | ✅ Accepted |
| 0005 | Graceful Shutdown | ✅ Accepted |
| 0006 | Configuration Management | ✅ Accepted |
| 0007 | OpenTelemetry Integration | ✅ Accepted |
| 0008 | BDD Testing with Godog | ✅ Accepted (structure superseded by 0024) |
| 0009 | BDD Testing with OpenAPI Documentation | ✅ Accepted |
| 0010 | API v2 Feature Flag | ✅ Accepted |
| 0011 | Validation Library (go-playground/validator) | ✅ Accepted |
| 0012 | Git Hooks: Staged-Only Formatting | ✅ Accepted |
| 0013 | OpenAPI/Swagger Toolchain (swaggo/swag) | ✅ Accepted |
| 0014 | gRPC Adoption Strategy | ❌ Rejected / Deferred |
| 0015 | CLI Subcommands with Cobra | ✅ Accepted |
| 0016 | CI/CD Pipeline Design | ✅ Accepted |
| 0017 | Trunk-Based Development Workflow | ✅ Accepted |
| 0018 | User Management and Auth System | ✅ Accepted |
| 0019 | PostgreSQL Integration | ✅ Accepted (SQLite cleanup pending) |
| 0020 | Docker Build Strategy | ✅ Accepted |
| 0021 | JWT Secret Retention Policy | 🟡 Proposed (base JWT done; cleanup job not implemented) |
| 0022 | Rate Limiting and Cache Strategy | 🟡 Proposed (not implemented — Gitea issue #13) |
| 0023 | Config Hot Reloading | 🟡 Proposed (not implemented) |
| 0024 | BDD Test Organization and Isolation | ✅ Accepted |
| 0025 | BDD Scenario Isolation Strategies | ✅ Accepted (Partial — Phase 2 pending ADR-0022) |

## What is an ADR?

An ADR is a document that captures an important architectural decision made along with its context and consequences.

## Format

Each ADR follows this structure:

```markdown
# [Short title is a few words]

* Status: [Proposed | Accepted | Deprecated | Superseded]
* Deciders: [List of decision makers]
* Date: [YYYY-MM-DD]

## Context and Problem Statement

[Describe the context and problem statement]

## Decision Drivers

* [Driver 1]
* [Driver 2]
* [Driver 3]

## Considered Options

* [Option 1]
* [Option 2]
* [Option 3]

## Decision Outcome

Chosen option: "[Option 1]" because [justification]

## Pros and Cons of the Options

### [Option 1]

* Good, because [argument a]
* Good, because [argument b]
* Bad, because [argument c]

### [Option 2]

* Good, because [argument a]
* Good, because [argument b]
* Bad, because [argument c]

## Links

* [Link type] [Link to ADR]
* [Link type] [Link to ADR]
```

## ADR List

* [0001-go-1.26.1-standard.md](0001-go-1.26.1-standard.md) - Use Go 1.26.1 as the standard Go version
* [0002-chi-router.md](0002-chi-router.md) - Use Chi router for HTTP routing
* [0003-zerolog-logging.md](0003-zerolog-logging.md) - Use Zerolog for structured logging
* [0004-interface-based-design.md](0004-interface-based-design.md) - Adopt interface-based design pattern
* [0005-graceful-shutdown.md](0005-graceful-shutdown.md) - Implement graceful shutdown with readiness endpoints
* [0006-configuration-management.md](0006-configuration-management.md) - Use Viper for configuration management
* [0007-opentelemetry-integration.md](0007-opentelemetry-integration.md) - Integrate OpenTelemetry for distributed tracing
* [0008-bdd-testing.md](0008-bdd-testing.md) - Adopt BDD with Godog for behavioral testing (structure superseded by 0024)
* [0009-hybrid-testing-approach.md](0009-hybrid-testing-approach.md) - BDD testing with OpenAPI documentation (SDK layer deferred)
* [0010-api-v2-feature-flag.md](0010-api-v2-feature-flag.md) - API v2 implementation with feature flag control
* [0011-validation-library-selection.md](0011-validation-library-selection.md) - Selection of go-playground/validator for input validation
* [0012-git-hooks-staged-only-formatting.md](0012-git-hooks-staged-only-formatting.md) - Git hooks format only staged Go files
* [0013-openapi-swagger-toolchain.md](0013-openapi-swagger-toolchain.md) - OpenAPI/Swagger documentation with swaggo/swag
* [0014-grpc-adoption-strategy.md](0014-grpc-adoption-strategy.md) - gRPC adoption strategy (rejected/deferred)
* [0015-cli-subcommands-cobra.md](0015-cli-subcommands-cobra.md) - Cobra CLI framework adoption
* [0016-ci-cd-pipeline-design.md](0016-ci-cd-pipeline-design.md) - CI/CD pipeline architecture
* [0017-trunk-based-development-workflow.md](0017-trunk-based-development-workflow.md) - Trunk-based development workflow
* [0018-user-management-auth-system.md](0018-user-management-auth-system.md) - User management and authentication system
* [0019-postgresql-integration.md](0019-postgresql-integration.md) - PostgreSQL database integration
* [0020-docker-build-strategy.md](0020-docker-build-strategy.md) - Docker Build Strategy: Traditional vs Buildx
* [0021-jwt-secret-retention-policy.md](0021-jwt-secret-retention-policy.md) - JWT Secret Retention Policy (base JWT done; cleanup job proposed)
* [0022-rate-limiting-cache-strategy.md](0022-rate-limiting-cache-strategy.md) - Rate Limiting and Cache Strategy (not yet implemented — issue #13)
* [0023-config-hot-reloading.md](0023-config-hot-reloading.md) - Config Hot Reloading Strategy (not yet implemented)
* [0024-bdd-test-organization-and-isolation.md](0024-bdd-test-organization-and-isolation.md) - BDD test modular organisation by domain
* [0025-bdd-scenario-isolation-strategies.md](0025-bdd-scenario-isolation-strategies.md) - Schema-per-scenario isolation for BDD tests (partial)

## How to Add a New ADR

1. Create a new file with the next available number (e.g., `0010-new-decision.md`)
2. Follow the template format
3. Update this README.md with the new ADR
4. Commit the changes

## Status Legend

* **Proposed**: Decision is being discussed
* **Accepted**: Decision has been made and implemented
* **Deprecated**: Decision is no longer relevant
* **Superseded**: Decision has been replaced by another ADR