Course Materials Upload

migrations/0006_add_course_materials.sql

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+-- Migration 0006: Add course_materials table for activity file attachments
+
+CREATE TABLE IF NOT EXISTS course_materials (
+    id          TEXT PRIMARY KEY,
+    activity_id TEXT NOT NULL,
+    title       TEXT NOT NULL,
+    description TEXT,
+    file_key    TEXT NOT NULL,
+    uploaded_by TEXT,
+    created_at  TEXT NOT NULL DEFAULT (datetime('now')),
+    FOREIGN KEY (activity_id) REFERENCES activities(id) ON DELETE CASCADE,
+    FOREIGN KEY (uploaded_by) REFERENCES users(id) ON DELETE SET NULL
+);
+
+CREATE INDEX IF NOT EXISTS idx_materials_activity ON course_materials(activity_id);
+CREATE INDEX IF NOT EXISTS idx_materials_uploader ON course_materials(uploaded_by);
+CREATE INDEX IF NOT EXISTS idx_materials_created  ON course_materials(activity_id, created_at DESC);