# ADR Implementation Tracker

This document tracks the implementation status and estimated effort for all Architectural Decision Records (ADRs).

## Effort Estimation Guide

| Rating | Description                                 | Typical Duration  |
| ------ | ------------------------------------------- | ----------------- |
| S      | Small - Simple, isolated changes            | 1-2 hours         |
| M      | Medium - Multiple files, some testing       | Half day to 1 day |
| L      | Large - Significant refactoring, many files | 1-3 days          |
| XL     | Extra Large - Major architectural change    | 1+ weeks          |

## Implementation Status Overview

| Status                       | Count |
| ---------------------------- | ----- |
| Accepted (Fully Implemented) | 30    |
| Partially Implemented        | 2     |
| Proposed (Not Started)       | 16    |

---

## Detailed Implementation Status

### Category 1: Foundational / Core Infrastructure

| ADR                                                              | Title                   | Status   | Effort | Notes                          |
| ---------------------------------------------------------------- | ----------------------- | -------- | ------ | ------------------------------ |
| [ADR-002](./0002-standardized-transaction-management.md)         | Transaction Management  | Accepted | -      | Fully implemented              |
| [ADR-007](./0007-configuration-and-secrets-management.md)        | Configuration & Secrets | Accepted | -      | Fully implemented              |
| [ADR-020](./0020-health-checks-and-liveness-readiness-probes.md) | Health Checks           | Accepted | -      | Fully implemented              |
| [ADR-030](./0030-graceful-degradation-and-circuit-breaker.md)    | Circuit Breaker         | Proposed | L      | New resilience patterns needed |

### Category 2: Data Management

| ADR                                                             | Title                    | Status   | Effort | Notes                          |
| --------------------------------------------------------------- | ------------------------ | -------- | ------ | ------------------------------ |
| [ADR-009](./0009-caching-strategy-for-read-heavy-operations.md) | Caching Strategy         | Accepted | -      | Fully implemented              |
| [ADR-013](./0013-database-schema-migration-strategy.md)         | Schema Migrations v1     | Proposed | M      | Superseded by ADR-023          |
| [ADR-019](./0019-data-backup-and-recovery-strategy.md)          | Backup & Recovery        | Accepted | -      | Fully implemented              |
| [ADR-023](./0023-database-schema-migration-strategy.md)         | Schema Migrations v2     | Proposed | L      | Requires tooling setup         |
| [ADR-031](./0031-data-retention-and-privacy-compliance.md)      | Data Retention & Privacy | Proposed | XL     | Legal/compliance review needed |

### Category 3: API & Integration

| ADR                                                                 | Title                    | Status      | Effort | Notes                                 |
| ------------------------------------------------------------------- | ------------------------ | ----------- | ------ | ------------------------------------- |
| [ADR-003](./0003-standardized-input-validation-using-middleware.md) | Input Validation         | Accepted    | -      | Fully implemented                     |
| [ADR-008](./0008-api-versioning-strategy.md)                        | API Versioning           | Proposed    | L      | Major URL/routing changes             |
| [ADR-018](./0018-api-documentation-strategy.md)                     | API Documentation        | Accepted    | -      | OpenAPI/Swagger implemented           |
| [ADR-022](./0022-real-time-notification-system.md)                  | Real-time Notifications  | Proposed    | XL     | WebSocket infrastructure              |
| [ADR-028](./0028-api-response-standardization.md)                   | Response Standardization | Implemented | L      | Completed (routes, middleware, tests) |

### Category 4: Security & Compliance

| ADR                                                                     | Title                 | Status   | Effort | Notes                            |
| ----------------------------------------------------------------------- | --------------------- | -------- | ------ | -------------------------------- |
| [ADR-001](./0001-standardized-error-handling.md)                        | Error Handling        | Accepted | -      | Fully implemented                |
| [ADR-011](./0011-advanced-authorization-and-access-control-strategy.md) | Authorization & RBAC  | Proposed | XL     | Policy engine, permission system |
| [ADR-016](./0016-api-security-hardening.md)                             | Security Hardening    | Accepted | -      | Fully implemented                |
| [ADR-029](./0029-secret-rotation-and-key-management.md)                 | Secret Rotation       | Proposed | L      | Infrastructure changes needed    |
| [ADR-032](./0032-rate-limiting-strategy.md)                             | Rate Limiting         | Accepted | -      | Fully implemented                |
| [ADR-033](./0033-file-upload-and-storage-strategy.md)                   | File Upload & Storage | Accepted | -      | Fully implemented                |

### Category 5: Observability & Monitoring

| ADR                                                                        | Title                       | Status   | Effort | Notes                             |
| -------------------------------------------------------------------------- | --------------------------- | -------- | ------ | --------------------------------- |
| [ADR-004](./0004-standardized-application-wide-structured-logging.md)      | Structured Logging          | Accepted | -      | Fully implemented                 |
| [ADR-015](./0015-application-performance-monitoring-and-error-tracking.md) | APM & Error Tracking        | Proposed | M      | Third-party integration           |
| [ADR-050](./0050-postgresql-function-observability.md)                     | PostgreSQL Fn Observability | Proposed | M      | Depends on ADR-015 implementation |

### Category 6: Deployment & Operations

| ADR                                                            | Title             | Status   | Effort | Notes                      |
| -------------------------------------------------------------- | ----------------- | -------- | ------ | -------------------------- |
| [ADR-006](./0006-background-job-processing-and-task-queues.md) | Background Jobs   | Accepted | -      | Fully implemented          |
| [ADR-014](./0014-containerization-and-deployment-strategy.md)  | Containerization  | Partial  | M      | Docker done, K8s pending   |
| [ADR-017](./0017-ci-cd-and-branching-strategy.md)              | CI/CD & Branching | Accepted | -      | Fully implemented          |
| [ADR-024](./0024-feature-flagging-strategy.md)                 | Feature Flags     | Proposed | M      | New service/library needed |
| [ADR-037](./0037-scheduled-jobs-and-cron-pattern.md)           | Scheduled Jobs    | Accepted | -      | Fully implemented          |
| [ADR-038](./0038-graceful-shutdown-pattern.md)                 | Graceful Shutdown | Accepted | -      | Fully implemented          |

### Category 7: Frontend / User Interface

| ADR                                                                      | Title                | Status   | Effort | Notes                                       |
| ------------------------------------------------------------------------ | -------------------- | -------- | ------ | ------------------------------------------- |
| [ADR-005](./0005-frontend-state-management-and-server-cache-strategy.md) | State Management     | Accepted | -      | Fully implemented                           |
| [ADR-012](./0012-frontend-component-library-and-design-system.md)        | Component Library    | Partial  | L      | Core components done, design tokens pending |
| [ADR-025](./0025-internationalization-and-localization-strategy.md)      | i18n & l10n          | Proposed | XL     | All UI strings need extraction              |
| [ADR-026](./0026-standardized-client-side-structured-logging.md)         | Client-Side Logging  | Accepted | -      | Fully implemented                           |
| [ADR-044](./0044-frontend-feature-organization.md)                       | Feature Organization | Accepted | -      | Fully implemented                           |

### Category 8: Development Workflow & Quality

| ADR                                                                           | Title                | Status   | Effort | Notes                |
| ----------------------------------------------------------------------------- | -------------------- | -------- | ------ | -------------------- |
| [ADR-010](./0010-testing-strategy-and-standards.md)                           | Testing Strategy     | Accepted | -      | Fully implemented    |
| [ADR-021](./0021-code-formatting-and-linting-unification.md)                  | Formatting & Linting | Accepted | -      | Fully implemented    |
| [ADR-027](./0027-standardized-naming-convention-for-ai-and-database-types.md) | Naming Conventions   | Accepted | -      | Fully implemented    |
| [ADR-045](./0045-test-data-factories-and-fixtures.md)                         | Test Data Factories  | Accepted | -      | Fully implemented    |
| [ADR-047](./0047-project-file-and-folder-organization.md)                     | Project Organization | Proposed | XL     | Major reorganization |

### Category 9: Architecture Patterns

| ADR                                                      | Title                 | Status   | Effort | Notes             |
| -------------------------------------------------------- | --------------------- | -------- | ------ | ----------------- |
| [ADR-034](./0034-repository-pattern-standards.md)        | Repository Pattern    | Accepted | -      | Fully implemented |
| [ADR-035](./0035-service-layer-architecture.md)          | Service Layer         | Accepted | -      | Fully implemented |
| [ADR-036](./0036-event-bus-and-pub-sub-pattern.md)       | Event Bus             | Accepted | -      | Fully implemented |
| [ADR-039](./0039-dependency-injection-pattern.md)        | Dependency Injection  | Accepted | -      | Fully implemented |
| [ADR-041](./0041-ai-gemini-integration-architecture.md)  | AI/Gemini Integration | Accepted | -      | Fully implemented |
| [ADR-042](./0042-email-and-notification-architecture.md) | Email & Notifications | Accepted | -      | Fully implemented |
| [ADR-043](./0043-express-middleware-pipeline.md)         | Middleware Pipeline   | Accepted | -      | Fully implemented |
| [ADR-046](./0046-image-processing-pipeline.md)           | Image Processing      | Accepted | -      | Fully implemented |
| [ADR-049](./0049-gamification-and-achievement-system.md) | Gamification System   | Accepted | -      | Fully implemented |

---

## Work Still To Be Completed (Priority Order)

These ADRs are proposed but not yet implemented, ordered by suggested implementation priority:

| Priority | ADR     | Title                       | Effort | Rationale                                         |
| -------- | ------- | --------------------------- | ------ | ------------------------------------------------- |
| 1        | ADR-015 | APM & Error Tracking        | M      | Production visibility, debugging                  |
| 1b       | ADR-050 | PostgreSQL Fn Observability | M      | Database function visibility (depends on ADR-015) |
| 2        | ADR-024 | Feature Flags               | M      | Safer deployments, A/B testing                    |
| 3        | ADR-023 | Schema Migrations v2        | L      | Database evolution support                        |
| 4        | ADR-029 | Secret Rotation             | L      | Security improvement                              |
| 5        | ADR-008 | API Versioning              | L      | Future API evolution                              |
| 6        | ADR-030 | Circuit Breaker             | L      | Resilience improvement                            |
| 7        | ADR-022 | Real-time Notifications     | XL     | Major feature enhancement                         |
| 8        | ADR-011 | Authorization & RBAC        | XL     | Advanced permission system                        |
| 9        | ADR-025 | i18n & l10n                 | XL     | Multi-language support                            |
| 10       | ADR-031 | Data Retention & Privacy    | XL     | Compliance requirements                           |

---

## Recent Implementation History

| Date       | ADR     | Change                                                                 |
| ---------- | ------- | ---------------------------------------------------------------------- |
| 2026-01-11 | ADR-050 | Created - PostgreSQL function observability with fn_log() and Logstash |
| 2026-01-11 | ADR-018 | Implemented - OpenAPI/Swagger documentation at /docs/api-docs          |
| 2026-01-11 | ADR-049 | Created - Gamification system, achievements, and testing requirements  |
| 2026-01-09 | ADR-047 | Created - Project file/folder organization with migration plan         |
| 2026-01-09 | ADR-041 | Created - AI/Gemini integration with model fallback and rate limiting  |
| 2026-01-09 | ADR-042 | Created - Email and notification architecture with BullMQ queuing      |
| 2026-01-09 | ADR-043 | Created - Express middleware pipeline ordering and patterns            |
| 2026-01-09 | ADR-044 | Created - Frontend feature-based folder organization                   |
| 2026-01-09 | ADR-045 | Created - Test data factory pattern for mock generation                |
| 2026-01-09 | ADR-046 | Created - Image processing pipeline with Sharp and EXIF stripping      |
| 2026-01-09 | ADR-026 | Fully implemented - client-side structured logger                      |
| 2026-01-09 | ADR-028 | Fully implemented - all routes, middleware, and tests updated          |

---

## Notes

- **Effort estimates** are rough guidelines and may vary based on current codebase state
- **Dependencies** between ADRs should be considered when planning implementation order
- This document should be updated when ADRs are implemented or status changes
