Complete backend MVP

migrations/006_completion_features.sql

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+CREATE TABLE IF NOT EXISTS notifications (
+    id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    user_id BIGINT UNSIGNED NOT NULL,
+    type VARCHAR(80) NOT NULL,
+    title VARCHAR(160) NOT NULL,
+    body TEXT NULL,
+    report_id BIGINT UNSIGNED NULL,
+    read_at DATETIME NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    CONSTRAINT notifications_user_fk FOREIGN KEY (user_id) REFERENCES users(id),
+    CONSTRAINT notifications_report_fk FOREIGN KEY (report_id) REFERENCES reports(id),
+    KEY notifications_user_read_created_idx (user_id, read_at, created_at),
+    KEY notifications_report_idx (report_id)
+);
+
+CREATE TABLE IF NOT EXISTS moderation_flags (
+    id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
+    content_type VARCHAR(30) NOT NULL,
+    report_id BIGINT UNSIGNED NOT NULL,
+    message_id BIGINT UNSIGNED NULL,
+    reason VARCHAR(120) NOT NULL,
+    details TEXT NULL,
+    status VARCHAR(30) NOT NULL DEFAULT 'OPEN',
+    created_by_user_id BIGINT UNSIGNED NOT NULL,
+    resolved_by_user_id BIGINT UNSIGNED NULL,
+    resolution_note TEXT NULL,
+    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    resolved_at DATETIME NULL,
+    CONSTRAINT moderation_flags_report_fk FOREIGN KEY (report_id) REFERENCES reports(id),
+    CONSTRAINT moderation_flags_message_fk FOREIGN KEY (message_id) REFERENCES messages(id),
+    CONSTRAINT moderation_flags_created_by_fk FOREIGN KEY (created_by_user_id) REFERENCES users(id),
+    CONSTRAINT moderation_flags_resolved_by_fk FOREIGN KEY (resolved_by_user_id) REFERENCES users(id),
+    KEY moderation_flags_status_created_idx (status, created_at),
+    KEY moderation_flags_report_idx (report_id),
+    KEY moderation_flags_message_idx (message_id)
+);
+
+ALTER TABLE reward_events
+    ADD UNIQUE KEY reward_events_report_reason_unique (report_id, reason);