# Implement Missing Phase 2 Features

I will implement the remaining features for Phase 2: **Advanced Replication** (Realtime) and **Resumable Uploads** (Storage).

## 1. Advanced Realtime Replication (`pgoutput`)
**Goal**: Replace the `LISTEN/NOTIFY` fallback with robust logical replication using the `pgoutput` protocol.

-   **Dependencies**: Add `pgoutput` crate and enable `replication` feature for `tokio-postgres`.
-   **Implementation**:
    -   Update `realtime/src/replication.rs` to connect to Postgres in **replication mode**.
    -   Create a replication slot (`madbase_slot`) and start streaming from publication (`madbase_pub`).
    -   Use `pgoutput::Decoder` to parse binary replication messages (`Relation`, `Insert`, `Update`, `Delete`).
    -   Maintain an in-memory cache of `Relation` metadata (schema, table, columns) to map relation IDs to names.
    -   Construct `PostgresPayload` from change events and broadcast to WebSocket clients.

## 2. Resumable Uploads (TUS Protocol)
**Goal**: Implement the TUS protocol for reliable large file uploads in the Storage service.

-   **Dependencies**: Add `base64` to `storage/Cargo.toml`.
-   **New Module**: Create `storage/src/tus.rs`.
-   **Endpoints**:
    -   `POST /storage/v1/upload/resumable`: Initialize upload. Creates a local tracking file.
    -   `PATCH /storage/v1/upload/resumable/:id`: Append data chunk to the local file.
    -   `HEAD /storage/v1/upload/resumable/:id`: Return current upload offset.
-   **Completion Logic**:
    -   When `offset == size`, stream the complete file to S3.
    -   Insert metadata into `storage.objects`.
    -   Clean up local temporary files.

## Execution Steps
1.  **Update Dependencies**: Modify `realtime/Cargo.toml` and `storage/Cargo.toml`.
2.  **Implement Realtime Replication**: Rewrite `realtime/src/replication.rs` with `pgoutput` logic.
3.  **Implement TUS Handlers**: Create `storage/src/tus.rs` and register routes in `storage/src/lib.rs`.
4.  **Verify**: Ensure compilation and check for basic logic correctness.