feat(data): prepare MongoDB-friendly repository interfaces

Codex Documentation/Current Software Plan/V1_BLOCKS_07_10_UPDATED/V1_BLOCK_09_Persistence_Preparation.md

@@ -1,8 +1,10 @@
 # V1 Block 09 — Persistence Preparation
 
-Status: Planned
+Status: In progress — Chunk 9.1 complete
 
-Purpose: Prepare the domain layer for local persistence without overbuilding sync or database implementation too early.
+Purpose: Prepare the domain layer for future MongoDB-backed persistence without adding a MongoDB driver, network behavior, sync behavior, or database runtime dependency too early.
+
+MongoDB is the committed persistence target. This block should make the core persistence-friendly and MongoDB-document-friendly while keeping the scheduling engine independent from database APIs.
 
 ## Chunk 9.1 — Repository interface
 
@@ -19,16 +21,27 @@ Define repository interfaces for:
 
 Rules:
 
-- Do not couple scheduling engine directly to SQLite.
+- Do not couple the scheduling engine directly to MongoDB APIs.
-- Use interfaces that a future Drift/SQLite layer can implement.
+- Use interfaces that a future MongoDB adapter can implement.
-- Keep current implementation in-memory if needed.
+- Keep the current implementation in-memory if needed.
 - Repository interfaces should preserve domain rules rather than bypassing services.
+- Do not introduce alternative database assumptions.
 
 Acceptance criteria:
 
 - Domain services can depend on interfaces.
 - Tests can use fake/in-memory repositories.
-- Interfaces do not import Drift, SQLite, Flutter, or platform-specific APIs.
+- Interfaces do not import MongoDB, Flutter, platform-specific APIs, or network/client APIs.
+- Interface names and method shapes are compatible with document-style persistence.
+
+Completed:
+
+- Added pure Dart repository interfaces for tasks, projects, locked blocks/overrides, and scheduling state snapshots.
+- Added in-memory repository implementations for tests and early app wiring.
+- Added scheduling snapshot state that can rebuild `SchedulingInput` and `SchedulingResult` without persistence APIs.
+- Exported repository interfaces through the public core library.
+- Added repository tests covering task/project/locked-block/snapshot fake usage.
+- Verified with `dart format lib test`, `dart analyze`, and `dart test`.
 
 BREAKPOINT: Stop here. Confirm `extra high` mode before implementing the persistence edge-case test suite.
 
@@ -53,70 +66,87 @@ Cover these cases:
 - backlog age behavior has a documented source timestamp or TODO before database work
 - in-memory fake repositories can round-trip saved records without losing scheduling fields
 - repository operations do not mutate input objects unexpectedly
+- document-shaped maps preserve all fields needed by future MongoDB persistence
+- generated document field names are stable and migration-friendly
 
 Rules:
 
 - This chunk may add tests and small model helpers needed to make persistence behavior testable.
-- Do not add Drift/SQLite implementation yet.
+- Do not add a MongoDB driver, MongoDB client, Atlas setup, connection string, local MongoDB service requirement, or database adapter yet.
+- Do not add alternative database mappings or non-MongoDB terminology.
 - Do not add sync, networking, cloud accounts, or background services.
 - Do not mark this chunk complete unless `dart analyze` and `dart test` pass.
 
 Acceptance criteria:
 
 - Persistence-sensitive test group exists.
-- Tests capture stable IDs, enum mapping, nullable-field behavior, and DateTime convention.
+- Tests capture stable IDs, enum mapping, nullable-field behavior, DateTime convention, and document-shaped mapping expectations.
 - Any unresolved persistence detail is documented as a TODO in the plan or architecture notes.
+- No alternative-database references remain in the active persistence plan.
 
 BREAKPOINT: Stop here. Confirm `high` mode before model serialization changes.
 
-## Chunk 9.3 — Serialization-safe models
+## Chunk 9.3 — MongoDB-document-safe models
 
 Recommended Codex level: high
 
 Tasks:
 
-Make models persistence-friendly:
+Make models persistence-friendly and MongoDB-document-friendly:
 
 - stable IDs
 - enum serialization helpers or clear mapping plan
 - DateTime handling convention
 - nullable fields documented
 - nullable field clear helpers where needed
-- migration-safe field names where possible
+- migration-safe document field names where possible
-- map/json-like conversion helpers only if they do not over-couple the domain layer
+- document-shaped map conversion helpers only if they do not over-couple the domain layer
+- clear mapping rules for nested task statistics and future child-task ownership fields
+
+Rules:
+
+- Keep model helpers independent from MongoDB client libraries.
+- Prefer plain Dart map/document shapes that a later adapter can translate into MongoDB documents.
+- Do not introduce database connection logic in this chunk.
+- Do not add table assumptions, joins, or relational schema requirements.
 
 Acceptance criteria:
 
-- Models can round-trip through map/json-like structures or have a clear TODO for Drift mappings.
+- Models can round-trip through document-shaped map/json-like structures or have a clear TODO for MongoDB document mappings.
 - Tests cover at least task serialization if implemented.
 - Tests cover enum persistence mapping if implemented.
 - Tests cover intentional clearing of nullable fields if helper behavior is added.
+- Tests confirm `not set` reward remains distinct from very low reward through mapping.
 
 BREAKPOINT: Stop here. Confirm `low` mode before documenting the explicit non-sync boundary.
 
-## Chunk 9.4 — Explicit non-sync boundary
+## Chunk 9.4 — Explicit non-sync / no-database-runtime boundary
 
 Recommended Codex level: low
 
 Tasks:
 
-Document that V1 persistence is local-first and sync is out of scope.
+Document that V1 persistence work prepares for MongoDB but does not implement runtime database access, sync, accounts, or background services.
 
 Rules:
 
 - No network sync code.
 - No cloud assumptions.
+- No MongoDB connection strings.
+- No Atlas setup.
+- No local MongoDB server requirement.
 - No background service implementation.
 - No mobile notification or background reconciliation implementation in this block.
 
 Acceptance criteria:
 
-- README or architecture doc states sync is future work.
+- README or architecture doc states MongoDB is the committed persistence target.
-- Docs distinguish local persistence preparation from actual sync.
+- README or architecture doc states this block does not require a running MongoDB instance.
+- Docs distinguish MongoDB persistence preparation from actual sync or database adapter implementation.
 - Wishlist/future notes contain sync as a later feature, not a V1 requirement.
 
 Commit suggestion:
 
 ```text
-feat(data): prepare persistence interfaces for scheduling core
+feat(data): prepare MongoDB-friendly persistence interfaces
 ```

Codex Documentation/Current Software Plan/V1_BLOCK_09_Persistence_Preparation.md

@@ -1,6 +1,6 @@
 # V1 Block 09 — Persistence Preparation
 
-Status: Planned
+Status: In progress — Chunk 9.1 complete
 
 Purpose: Prepare the domain layer for future MongoDB-backed persistence without adding a MongoDB driver, network behavior, sync behavior, or database runtime dependency too early.
 
@@ -34,6 +34,15 @@ Acceptance criteria:
 - Interfaces do not import MongoDB, Flutter, platform-specific APIs, or network/client APIs.
 - Interface names and method shapes are compatible with document-style persistence.
 
+Completed:
+
+- Added pure Dart repository interfaces for tasks, projects, locked blocks/overrides, and scheduling state snapshots.
+- Added in-memory repository implementations for tests and early app wiring.
+- Added scheduling snapshot state that can rebuild `SchedulingInput` and `SchedulingResult` without persistence APIs.
+- Exported repository interfaces through the public core library.
+- Added repository tests covering task/project/locked-block/snapshot fake usage.
+- Verified with `dart format lib test`, `dart analyze`, and `dart test`.
+
 BREAKPOINT: Stop here. Confirm `extra high` mode before implementing the persistence edge-case test suite.
 
 ## Chunk 9.2 — Persistence edge-case regression test suite
@@ -64,7 +73,7 @@ Rules:
 
 - This chunk may add tests and small model helpers needed to make persistence behavior testable.
 - Do not add a MongoDB driver, MongoDB client, Atlas setup, connection string, local MongoDB service requirement, or database adapter yet.
-- Do not add alternative database mappings or SQL-specific terminology.
+- Do not add alternative database mappings or non-MongoDB terminology.
 - Do not add sync, networking, cloud accounts, or background services.
 - Do not mark this chunk complete unless `dart analyze` and `dart test` pass.
 
@@ -99,7 +108,7 @@ Rules:
 - Keep model helpers independent from MongoDB client libraries.
 - Prefer plain Dart map/document shapes that a later adapter can translate into MongoDB documents.
 - Do not introduce database connection logic in this chunk.
-- Do not add SQL-style table assumptions, joins, or relational schema requirements.
+- Do not add table assumptions, joins, or relational schema requirements.
 
 Acceptance criteria:
 

lib/scheduler_core.dart

@@ -21,6 +21,7 @@ export 'src/backlog.dart';
 export 'src/child_tasks.dart';
 export 'src/locked_time.dart';
 export 'src/quick_capture.dart';
+export 'src/repositories.dart';
 export 'src/scheduling_engine.dart';
 export 'src/task_actions.dart';
 export 'src/task_statistics.dart';

lib/src/repositories.dart

@@ -0,0 +1,300 @@
+// Persistence boundary interfaces for the scheduling core.
+//
+// These interfaces are intentionally database-client-free. A future MongoDB
+// adapter can implement them with document storage while the domain layer and
+// tests keep using the same pure Dart contracts.
+
+import 'locked_time.dart';
+import 'models.dart';
+import 'scheduling_engine.dart';
+
+/// Repository contract for task documents.
+abstract interface class TaskRepository {
+  /// Return a task by stable id, or null when it does not exist.
+  Future<Task?> findById(String id);
+
+  /// Return all tasks currently known to the repository.
+  Future<List<Task>> findAll();
+
+  /// Return tasks with a lifecycle status.
+  Future<List<Task>> findByStatus(TaskStatus status);
+
+  /// Return tasks that overlap [window] by scheduled start/end.
+  Future<List<Task>> findScheduledInWindow(SchedulingWindow window);
+
+  /// Save or replace [task] by stable id.
+  Future<void> save(Task task);
+
+  /// Save or replace every task by stable id.
+  Future<void> saveAll(Iterable<Task> tasks);
+}
+
+/// Repository contract for project profile documents.
+abstract interface class ProjectRepository {
+  /// Return a project by stable id, or null when it does not exist.
+  Future<ProjectProfile?> findById(String id);
+
+  /// Return all projects currently known to the repository.
+  Future<List<ProjectProfile>> findAll();
+
+  /// Save or replace [project] by stable id.
+  Future<void> save(ProjectProfile project);
+}
+
+/// Repository contract for locked-block and one-day override documents.
+abstract interface class LockedBlockRepository {
+  /// Return a locked block by stable id, or null when it does not exist.
+  Future<LockedBlock?> findBlockById(String id);
+
+  /// Return all locked block definitions.
+  Future<List<LockedBlock>> findAllBlocks();
+
+  /// Return an override by stable id, or null when it does not exist.
+  Future<LockedBlockOverride?> findOverrideById(String id);
+
+  /// Return all one-day overrides.
+  Future<List<LockedBlockOverride>> findAllOverrides();
+
+  /// Save or replace [block] by stable id.
+  Future<void> saveBlock(LockedBlock block);
+
+  /// Save or replace [override] by stable id.
+  Future<void> saveOverride(LockedBlockOverride override);
+}
+
+/// Snapshot of one scheduling operation or persisted planning state.
+class SchedulingStateSnapshot {
+  const SchedulingStateSnapshot({
+    required this.id,
+    required this.capturedAt,
+    required this.window,
+    required this.tasks,
+    this.lockedIntervals = const <TimeInterval>[],
+    this.requiredVisibleIntervals = const <TimeInterval>[],
+    this.notices = const <SchedulingNotice>[],
+    this.changes = const <SchedulingChange>[],
+    this.overlaps = const <SchedulingOverlap>[],
+    this.operationName,
+  });
+
+  /// Stable snapshot id.
+  final String id;
+
+  /// Time this snapshot was created.
+  final DateTime capturedAt;
+
+  /// Planning window represented by the snapshot.
+  final SchedulingWindow window;
+
+  /// Task documents visible to the operation.
+  final List<Task> tasks;
+
+  /// Locked intervals supplied to the scheduler.
+  final List<TimeInterval> lockedIntervals;
+
+  /// Extra visible required intervals supplied to the scheduler.
+  final List<TimeInterval> requiredVisibleIntervals;
+
+  /// Human-readable scheduling notices.
+  final List<SchedulingNotice> notices;
+
+  /// Machine-readable task movements.
+  final List<SchedulingChange> changes;
+
+  /// Analysis-only overlap findings.
+  final List<SchedulingOverlap> overlaps;
+
+  /// Optional operation label, such as `push` or `rollover`.
+  final String? operationName;
+
+  /// Rebuild scheduler input from the persisted state shape.
+  SchedulingInput get input {
+    return SchedulingInput(
+      tasks: List<Task>.unmodifiable(tasks),
+      window: window,
+      lockedIntervals: List<TimeInterval>.unmodifiable(lockedIntervals),
+      requiredVisibleIntervals:
+          List<TimeInterval>.unmodifiable(requiredVisibleIntervals),
+    );
+  }
+
+  /// Rebuild scheduler result details from the persisted state shape.
+  SchedulingResult get result {
+    return SchedulingResult(
+      tasks: List<Task>.unmodifiable(tasks),
+      notices: List<SchedulingNotice>.unmodifiable(notices),
+      changes: List<SchedulingChange>.unmodifiable(changes),
+      overlaps: List<SchedulingOverlap>.unmodifiable(overlaps),
+    );
+  }
+}
+
+/// Repository contract for scheduling operation/state snapshot documents.
+abstract interface class SchedulingSnapshotRepository {
+  /// Return a snapshot by stable id, or null when it does not exist.
+  Future<SchedulingStateSnapshot?> findById(String id);
+
+  /// Return all snapshots overlapping [window].
+  Future<List<SchedulingStateSnapshot>> findInWindow(SchedulingWindow window);
+
+  /// Save or replace [snapshot] by stable id.
+  Future<void> save(SchedulingStateSnapshot snapshot);
+}
+
+/// In-memory task repository useful for tests and early application wiring.
+class InMemoryTaskRepository implements TaskRepository {
+  InMemoryTaskRepository([Iterable<Task> initialTasks = const []])
+      : _tasksById = {
+          for (final task in initialTasks) task.id: task,
+        };
+
+  final Map<String, Task> _tasksById;
+
+  @override
+  Future<Task?> findById(String id) async {
+    return _tasksById[id];
+  }
+
+  @override
+  Future<List<Task>> findAll() async {
+    return List<Task>.unmodifiable(_tasksById.values);
+  }
+
+  @override
+  Future<List<Task>> findByStatus(TaskStatus status) async {
+    return List<Task>.unmodifiable(
+      _tasksById.values.where((task) => task.status == status),
+    );
+  }
+
+  @override
+  Future<List<Task>> findScheduledInWindow(SchedulingWindow window) async {
+    return List<Task>.unmodifiable(
+      _tasksById.values.where((task) {
+        final start = task.scheduledStart;
+        final end = task.scheduledEnd;
+        if (start == null || end == null) {
+          return false;
+        }
+        return TimeInterval(start: start, end: end).overlaps(window.interval);
+      }),
+    );
+  }
+
+  @override
+  Future<void> save(Task task) async {
+    _tasksById[task.id] = task;
+  }
+
+  @override
+  Future<void> saveAll(Iterable<Task> tasks) async {
+    for (final task in tasks) {
+      _tasksById[task.id] = task;
+    }
+  }
+}
+
+/// In-memory project repository useful for tests and early application wiring.
+class InMemoryProjectRepository implements ProjectRepository {
+  InMemoryProjectRepository(
+      [Iterable<ProjectProfile> initialProjects = const []])
+      : _projectsById = {
+          for (final project in initialProjects) project.id: project,
+        };
+
+  final Map<String, ProjectProfile> _projectsById;
+
+  @override
+  Future<ProjectProfile?> findById(String id) async {
+    return _projectsById[id];
+  }
+
+  @override
+  Future<List<ProjectProfile>> findAll() async {
+    return List<ProjectProfile>.unmodifiable(_projectsById.values);
+  }
+
+  @override
+  Future<void> save(ProjectProfile project) async {
+    _projectsById[project.id] = project;
+  }
+}
+
+/// In-memory locked-time repository useful for tests and early wiring.
+class InMemoryLockedBlockRepository implements LockedBlockRepository {
+  InMemoryLockedBlockRepository({
+    Iterable<LockedBlock> initialBlocks = const [],
+    Iterable<LockedBlockOverride> initialOverrides = const [],
+  })  : _blocksById = {
+          for (final block in initialBlocks) block.id: block,
+        },
+        _overridesById = {
+          for (final override in initialOverrides) override.id: override,
+        };
+
+  final Map<String, LockedBlock> _blocksById;
+  final Map<String, LockedBlockOverride> _overridesById;
+
+  @override
+  Future<LockedBlock?> findBlockById(String id) async {
+    return _blocksById[id];
+  }
+
+  @override
+  Future<List<LockedBlock>> findAllBlocks() async {
+    return List<LockedBlock>.unmodifiable(_blocksById.values);
+  }
+
+  @override
+  Future<LockedBlockOverride?> findOverrideById(String id) async {
+    return _overridesById[id];
+  }
+
+  @override
+  Future<List<LockedBlockOverride>> findAllOverrides() async {
+    return List<LockedBlockOverride>.unmodifiable(_overridesById.values);
+  }
+
+  @override
+  Future<void> saveBlock(LockedBlock block) async {
+    _blocksById[block.id] = block;
+  }
+
+  @override
+  Future<void> saveOverride(LockedBlockOverride override) async {
+    _overridesById[override.id] = override;
+  }
+}
+
+/// In-memory snapshot repository useful for tests and early application wiring.
+class InMemorySchedulingSnapshotRepository
+    implements SchedulingSnapshotRepository {
+  InMemorySchedulingSnapshotRepository([
+    Iterable<SchedulingStateSnapshot> initialSnapshots = const [],
+  ]) : _snapshotsById = {
+          for (final snapshot in initialSnapshots) snapshot.id: snapshot,
+        };
+
+  final Map<String, SchedulingStateSnapshot> _snapshotsById;
+
+  @override
+  Future<SchedulingStateSnapshot?> findById(String id) async {
+    return _snapshotsById[id];
+  }
+
+  @override
+  Future<List<SchedulingStateSnapshot>> findInWindow(
+    SchedulingWindow window,
+  ) async {
+    return List<SchedulingStateSnapshot>.unmodifiable(
+      _snapshotsById.values.where(
+        (snapshot) => snapshot.window.interval.overlaps(window.interval),
+      ),
+    );
+  }
+
+  @override
+  Future<void> save(SchedulingStateSnapshot snapshot) async {
+    _snapshotsById[snapshot.id] = snapshot;
+  }
+}

test/repositories_test.dart

@@ -0,0 +1,147 @@
+import 'package:adhd_scheduler_core/scheduler_core.dart';
+import 'package:test/test.dart';
+
+void main() {
+  group('Repository interfaces', () {
+    final createdAt = DateTime(2026, 6, 21, 8);
+    final window = SchedulingWindow(
+      start: DateTime(2026, 6, 21, 9),
+      end: DateTime(2026, 6, 21, 17),
+    );
+
+    test('task repository supports in-memory fakes for domain services',
+        () async {
+      final backlogTask = task(
+        id: 'backlog',
+        title: 'Backlog task',
+        status: TaskStatus.backlog,
+        createdAt: createdAt,
+      );
+      final scheduledTask = task(
+        id: 'scheduled',
+        title: 'Scheduled task',
+        status: TaskStatus.planned,
+        createdAt: createdAt,
+        scheduledStart: DateTime(2026, 6, 21, 10),
+        scheduledEnd: DateTime(2026, 6, 21, 10, 30),
+      );
+      final repository = InMemoryTaskRepository([backlogTask]);
+
+      await repository.save(scheduledTask);
+
+      expect(await repository.findById('backlog'), same(backlogTask));
+      expect(await repository.findByStatus(TaskStatus.backlog), [backlogTask]);
+      expect(
+        (await repository.findScheduledInWindow(window)).map((task) => task.id),
+        ['scheduled'],
+      );
+    });
+
+    test('project repository stores project profiles by stable id', () async {
+      const project = ProjectProfile(
+        id: 'home',
+        name: 'Home',
+        colorKey: 'project-home',
+      );
+      final repository = InMemoryProjectRepository();
+
+      await repository.save(project);
+
+      expect(await repository.findById('home'), same(project));
+      expect(await repository.findAll(), [project]);
+    });
+
+    test('locked block repository separates blocks from overrides', () async {
+      final block = LockedBlock(
+        id: 'work',
+        name: 'Work',
+        startTime: const ClockTime(hour: 9, minute: 0),
+        endTime: const ClockTime(hour: 17, minute: 0),
+        recurrence: const LockedBlockRecurrence.weekly(
+          weekdays: {LockedWeekday.monday},
+        ),
+        createdAt: createdAt,
+        updatedAt: createdAt,
+      );
+      final override = LockedBlockOverride.remove(
+        id: 'holiday',
+        lockedBlockId: block.id,
+        date: DateTime(2026, 6, 22),
+        createdAt: createdAt,
+      );
+      final repository = InMemoryLockedBlockRepository();
+
+      await repository.saveBlock(block);
+      await repository.saveOverride(override);
+
+      expect(await repository.findBlockById('work'), same(block));
+      expect(await repository.findOverrideById('holiday'), same(override));
+      expect(await repository.findAllBlocks(), [block]);
+      expect(await repository.findAllOverrides(), [override]);
+    });
+
+    test('scheduling snapshot repository preserves scheduler input shape',
+        () async {
+      final scheduledTask = task(
+        id: 'scheduled',
+        title: 'Scheduled task',
+        status: TaskStatus.planned,
+        createdAt: createdAt,
+        scheduledStart: DateTime(2026, 6, 21, 10),
+        scheduledEnd: DateTime(2026, 6, 21, 10, 30),
+      );
+      final lockedInterval = TimeInterval(
+        start: DateTime(2026, 6, 21, 12),
+        end: DateTime(2026, 6, 21, 13),
+        label: 'Lunch',
+      );
+      final snapshot = SchedulingStateSnapshot(
+        id: 'snapshot-1',
+        capturedAt: DateTime(2026, 6, 21, 8, 30),
+        window: window,
+        tasks: [scheduledTask],
+        lockedIntervals: [lockedInterval],
+        notices: const [
+          SchedulingNotice('Saved schedule'),
+        ],
+        operationName: 'load-day',
+      );
+      final repository = InMemorySchedulingSnapshotRepository();
+
+      await repository.save(snapshot);
+
+      final saved = await repository.findById('snapshot-1');
+      expect(saved, same(snapshot));
+      expect(saved!.input.tasks, [scheduledTask]);
+      expect(saved.input.lockedIntervals, [lockedInterval]);
+      expect(saved.result.tasks, [scheduledTask]);
+      expect(saved.result.notices.single.message, 'Saved schedule');
+      expect(
+        (await repository.findInWindow(window)).map((snapshot) => snapshot.id),
+        ['snapshot-1'],
+      );
+    });
+  });
+}
+
+Task task({
+  required String id,
+  required String title,
+  required TaskStatus status,
+  required DateTime createdAt,
+  DateTime? scheduledStart,
+  DateTime? scheduledEnd,
+}) {
+  return Task(
+    id: id,
+    title: title,
+    projectId: 'inbox',
+    type: TaskType.flexible,
+    status: status,
+    durationMinutes: 30,
+    scheduledStart: scheduledStart,
+    scheduledEnd: scheduledEnd,
+    createdAt: createdAt,
+    updatedAt: createdAt,
+  );
+}