# Task: Contain backend feature mapping

## Feature

`docs/FEATURES/platform-scaffold.md`

## Goal

Move backend feature-specific persistence mapping out of the shared `AppDbContext` body and into the owning `Modules/<Feature>/Data` folders.

## Context

Architecture docs state that current backend feature code stays under `Modules/<Feature>`. `AppDbContext` remains the shared EF Core composition point, but feature-owned model configuration should live with the feature entities.

## Files Likely To Change

- `backend/src/Socialize.Api/Data/AppDbContext.cs`
- `backend/src/Socialize.Api/Modules/*/Data/*`

## Constraints

- Do not change API contracts.
- Do not change table names, indexes, or column constraints.
- Do not introduce a broader persistence refactor.

## Done When

- [x] Feature entity mappings live under the owning module folders.
- [x] `AppDbContext` delegates feature configuration to modules.
- [x] Backend build passes.

## Validation Commands

```bash
dotnet build backend/Socialize.slnx
dotnet test backend/Socialize.slnx
```