focus-flow/archive/Archived plans/V1_BLOCK_23_Export_Abstraction_Layer.md

V1 Block 23 — Export Abstraction Layer

Purpose: Define Export controller and writer interface.

Note for Codex: Follow tasks exactly; avoid exploratory calls when tasks specify names/files/tests.

Chunk 23.1 — Export controller contract

Recommended level: XHIGH

Status: Complete on 2026-06-26.

Tasks

1. Add package packages/scheduler_export.
2. Define abstract class ExportWriter with Future<void> begin(ExportContext), Future<void> writeTask(Task), Future<void> end(), plus factory registry.
3. Define ExportController orchestrating repository queries and writer.
4. Provide context object with ownerId, timezone, version.

Acceptance criteria

1. JSONWriter and CSVWriter stubs compile and implement interface.
2. Unit test writes small set and verifies output.

Completed implementation

1. Added package packages/scheduler_export with public entry points export.dart and scheduler_export.dart.
2. Added ExportContext carrying ownerId, timezone, and version.
3. Added ExportWriter, ExportWriterFactory, and ExportWriterRegistry with default json and csv mappings.
4. Added ExportController that reads owner-scoped paged tasks through TaskRepository and streams them to a writer.
5. Added compiling JsonExportWriter and CsvExportWriter implementations backed by StringSink.
6. Added unit tests for owner-scoped JSON export, CSV output, and custom writer factory registration.
7. Wired export tests into the root test wrapper.

Verification

1. dart pub get: passed.
2. dart format test/scheduler_core_test.dart packages/scheduler_export: passed.
3. cd packages/scheduler_export && dart analyze: passed, no issues found.
4. cd packages/scheduler_export && dart test: passed, 3 tests.
5. dart analyze: passed, no issues found.
6. dart test: passed, 327 tests.
7. scripts/test.sh: not present or not executable.

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