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+# Training Task Class Scope Design
+
+## Goal
+
+Limit teacher-edited training tasks to the students in teaching classes created by that teacher, while allowing platform administrators to maintain a system default version.
+
+Students should see the training task configuration for their own teaching class. If their teaching class has no custom configuration, they should see the administrator-maintained default task.
+
+## Current Behavior
+
+Training task configuration is currently global:
+
+- The teacher page reads `/api/training-tasks`.
+- Student task pages read `/api/training-tasks/key/{taskKey}`.
+- The `training_task` table is keyed by `task_key`.
+- The student side does not pass or resolve a teaching class when loading the task background, goals, requirements, or material.
+
+The student menu is currently mostly route-driven in the frontend. Training task records override titles and provide content/materials, but they are not the only source of menu existence.
+
+## Target Roles
+
+Administrator:
+
+- Maintains system default training tasks.
+- These defaults are used when a teaching class has no custom task configuration.
+- The system should initialize with default task skeletons so the menu/task catalog has stable keys, names, sort order, and enabled state.
+
+Teacher:
+
+- Can edit training task configurations only for teaching classes created by that teacher.
+- Must choose a teaching class before editing training tasks.
+- Saved configurations affect only that teaching class.
+
+Student:
+
+- Loads task configuration according to the student's teaching class.
+- Cannot choose or spoof another teaching class id through the frontend API.
+- Sees class-specific configuration first, then administrator default configuration as fallback.
+
+## Data Model
+
+Keep `training_task` as the administrator default task table.
+
+Add a class-level override table, suggested name: `training_task_class_config`.
+
+Suggested fields:
+
+- `id`
+- `teaching_class_id`
+- `task_key`
+- `project_name`
+- `task_name`
+- `background`
+- `objectives`
+- `requirements`
+- `steps`
+- `material_name`
+- `material_url`
+- `sort`
+- `enabled`
+- `created_by`
+- `create_time`
+- `update_time`
+
+Unique rules:
+
+- `training_task.task_key` remains unique for default tasks.
+- `training_task_class_config` uses unique key `(teaching_class_id, task_key)`.
+
+Indexes:
+
+- `(teaching_class_id, task_key)`
+- `(teaching_class_id, enabled, sort)`
+- `created_by` if teacher-owned filtering needs fast lookup.
+
+## Default Task Initialization
+
+The system should initialize built-in task skeletons in `training_task`.
+
+The skeleton must include:
+
+- `task_key`
+- `project_name`
+- `task_name`
+- `sort`
+- `enabled`
+
+The content fields can be empty if needed:
+
+- `background`
+- `objectives`
+- `requirements`
+- `material_name`
+- `material_url`
+
+This ensures administrators and teachers always have a stable task catalog to edit, and students always have a fallback source.
+
+## Backend API Design
+
+Administrator APIs:
+
+- Existing `/api/training-tasks` can remain the default task management API.
+- Only administrator-level users should be allowed to create or edit default tasks after this change.
+- These APIs operate on `training_task`.
+
+Teacher APIs:
+
+- Add class-scoped endpoints, for example:
+  - `GET /api/training-tasks/classes/{teachingClassId}`
+  - `GET /api/training-tasks/classes/{teachingClassId}/key/{taskKey}`
+  - `PUT /api/training-tasks/classes/{teachingClassId}/{taskKey}`
+- Backend must verify the teaching class was created by the current teacher.
+- Teacher saves write to `training_task_class_config`.
+- If a class row does not exist yet, save should create it from the default task plus the submitted changes.
+
+Student APIs:
+
+- Keep student-facing loading simple, for example:
+  - `GET /api/training-tasks/key/{taskKey}`
+- Backend resolves the logged-in student and determines the student's teaching class.
+- Backend returns class override if present and enabled.
+- If no class override exists, backend returns administrator default.
+- The frontend should not pass `teachingClassId` for student reads.
+
+## Student Class Resolution
+
+The first implementation should assume one effective teaching class for a student.
+
+Resolution order:
+
+1. Find the student's teaching class membership.
+2. If multiple teaching classes exist, choose the most deterministic current behavior available in existing data.
+3. If there is no teaching class membership, fall back to administrator default task.
+
+If the product later needs multiple active teaching classes per student, add an explicit student-side teaching class switcher instead of guessing.
+
+## Frontend Changes
+
+Administrator side:
+
+- Add a training task management menu.
+- Reuse the current task editing UI where practical.
+- The page edits default tasks, not class overrides.
+
+Teacher side:
+
+- Training task management page starts with a teaching class selector.
+- Selector lists only teaching classes created by the logged-in teacher.
+- After selecting a class, the page loads class-specific task configuration with default fallback values.
+- Save writes only to the selected teaching class.
+
+Student side:
+
+- Continue loading each route by `taskKey`.
+- Display returned background, goals, requirements, and material.
+- No student-side teaching class id should be sent.
+
+## Fallback Rules
+
+For a student task page:
+
+1. Use enabled class-specific task config for the student's teaching class.
+2. If missing, use enabled administrator default task.
+3. If default is missing, keep the route/menu stable but render empty content or a "not configured" state.
+
+For teacher edit pages:
+
+1. Show class override if it exists.
+2. Otherwise show administrator default values as editable initial values.
+3. Saving creates the class override.
+
+## Migration
+
+Existing rows in `training_task` remain administrator default tasks.
+
+Add the new class override table without deleting or rewriting existing default tasks.
+
+No class override rows need to be generated immediately. They can be created lazily when a teacher saves a class configuration.
+
+## Risks And Decisions
+
+Multiple teaching classes per student:
+
+- Initial behavior should use one effective class or fallback to default.
+- A later switcher can support explicit multi-class selection.
+
+Permission leakage:
+
+- Student reads must resolve class server-side.
+- Teacher edits must verify class ownership server-side.
+
+Menu consistency:
+
+- Current student menus are route-driven.
+- Default task skeletons are still required to make task names, enabled state, sort order, and fallback content manageable from the admin side.
+
+## Acceptance Criteria
+
+- Administrators can edit default training task configuration from an admin menu.
+- Teachers can edit training task configuration only after selecting one of their own teaching classes.
+- A teacher cannot edit another teacher's teaching class task configuration.
+- Students see their teaching class configuration when it exists.
+- Students fall back to administrator default configuration when their class has no configuration.
+- Case material follows the same class-specific then default fallback rule.
+- The system initializes default task skeletons for all built-in task keys.