EPIC: Data Layer Foundations

[hemanandr]

EPIC: Data Layer Foundations

Labels: type:epic, area:data, priority:P1 | Estimate: 3–4d | Size: L | Confidence: 0.9

Outcome

EF Core entities, DbContext, migrations, and config snapshots are implemented and running on SQLite and PostgreSQL.

Why

This unblocks all API and job work; it’s the bedrock for the app.

Scope

• Entities/mappings/migrations
• Config versioning snapshots (DB + filesystem)
• Seeder + settings watermarks

Links

• /PROJECT_PLAN.md
• /docs/data-model.cs
• /docs/config.schema.json

Acceptance

• Migrations apply cleanly on SQLite and PostgreSQL
• Round-trip CRUD works for every entity
• Config apply creates a snapshot record and file
• Unit tests green

Checklist

• ISSUE-01.1
• ISSUE-01.2
• ISSUE-01.3

[hemanandr]

✅ COMPLETE - Phase 2 finished per DEVELOPMENT_PLAN.md

All data layer components are complete and operational:

• EF Core with SQLite properly configured and tested
• ConfigVersion storage with SHA-256 hash-based duplicate detection
• Settings service with memory caching and watermark tracking
• Database migrations and entities match documented data model exactly

Key commits: #56 (PR), 88e2dc0, 61626cb