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skills/firebase-data-connect-basics/SKILL.md

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+---
+name: firebase-data-connect
+description: Build and deploy Firebase Data Connect backends with PostgreSQL. Use for schema design, GraphQL queries/mutations, authorization, and SDK generation for web, Android, iOS, and Flutter apps.
+---
+
+# Firebase Data Connect
+
+Firebase Data Connect is a relational database service using Cloud SQL for PostgreSQL with GraphQL schema, auto-generated queries/mutations, and type-safe SDKs.
+
+## Project Structure
+
+```
+dataconnect/
+├── dataconnect.yaml      # Service configuration
+├── schema/
+│   └── schema.gql        # Data model (types with @table)
+└── connector/
+    ├── connector.yaml    # Connector config + SDK generation
+    ├── queries.gql       # Queries
+    └── mutations.gql     # Mutations
+```
+
+## Development Workflow
+
+Follow this strict workflow to build your application. You **must** read the linked reference files for each step to understand the syntax and available features.
+
+### 1. Define Data Model (`schema/schema.gql`)
+Define your GraphQL types, tables, and relationships.
+> **Read [reference/schema.md](reference/schema.md)** for:
+> *   `@table`, `@col`, `@default`
+> *   Relationships (`@ref`, one-to-many, many-to-many)
+> *   Data types (UUID, Vector, JSON, etc.)
+
+### 2. Define Operations (`connector/queries.gql`, `connector/mutations.gql`)
+Write the queries and mutations your client will use. Data Connect generates the underlying SQL.
+> **Read [reference/operations.md](reference/operations.md)** for:
+> *   **Queries**: Filtering (`where`), Ordering (`orderBy`), Pagination (`limit`/`offset`).
+> *   **Mutations**: Create (`_insert`), Update (`_update`), Delete (`_delete`).
+> *   **Upserts**: Use `_upsert` to "insert or update" records (CRITICAL for user profiles).
+> *   **Transactions**: use `@transaction` for multi-step atomic operations.
+
+### 3. Secure Your App (`connector/` files)
+Add authorization logic closely with your operations.
+> **Read [reference/security.md](reference/security.md)** for:
+> *   `@auth(level: ...)` for PUBLIC, USER, or NO_ACCESS.
+> *   `@check` and `@redact` for row-level security and validation.
+
+### 4. Generate & Use SDKs
+Generate type-safe code for your client platform.
+> **Read [reference/sdks.md](reference/sdks.md)** for:
+> *   Android (Kotlin), iOS (Swift), Web (TypeScript), Flutter (Dart).
+> *   How to initialize and call your queries/mutations.
+> *   **Nested Data**: See how to access related fields (e.g., `movie.reviews`).
+
+---
+
+## Feature Capability Map
+
+If you need to implement a specific feature, consult the mapped reference file:
+
+| Feature | Reference File | Key Concepts |
+| :--- | :--- | :--- |
+| **Data Modeling** | [reference/schema.md](reference/schema.md) | `@table`, `@unique`, `@index`, Relations |
+| **Vector Search** | [reference/advanced.md](reference/advanced.md) | `Vector`, `@col(dataType: "vector")` |
+| **Full-Text Search** | [reference/advanced.md](reference/advanced.md) | `@searchable` |
+| **Upserting Data** | [reference/operations.md](reference/operations.md) | `_upsert` mutations |
+| **Complex Filters** | [reference/operations.md](reference/operations.md) | `_or`, `_and`, `_not`, `eq`, `contains` |
+| **Transactions** | [reference/operations.md](reference/operations.md) | `@transaction`, `response` binding |
+| **Environment Config** | [reference/config.md](reference/config.md) | `dataconnect.yaml`, `connector.yaml` |
+
+---
+
+## Deployment & CLI
+
+> **Read [reference/config.md](reference/config.md)** for deep dive on configuration.
+
+Common commands (run from project root):
+
+```bash
+# Initialize Data Connect
+firebase init dataconnect
+
+# Start local emulator
+firebase emulators:start --only dataconnect
+
+# Generate SDK code
+firebase dataconnect:sdk:generate
+
+# Deploy to production
+firebase deploy --only dataconnect
+```
+
+## Examples
+
+For complete, working code examples of schemas and operations, see **[examples.md](examples.md)**.