Inbox Message & bugs

src/main/resources/db/migration/V9__notification_message.sql

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+-- V9: Add notification and private message support
+
+-- Notification table: system/reply/like alerts to a user
+CREATE TABLE IF NOT EXISTS notification (
+    id          INT PRIMARY KEY AUTO_INCREMENT,
+    user_id     INT NOT NULL,           -- receiver
+    from_user_id INT,                   -- sender (NULL for system notifications)
+    type        VARCHAR(50) NOT NULL,   -- 'reply', 'like', 'system'
+    title       VARCHAR(200),
+    content     TEXT,
+    related_id  INT,                    -- e.g. discussion_id or post_id
+    related_type VARCHAR(50),           -- 'discussion', 'post'
+    is_read     BOOLEAN DEFAULT FALSE,
+    create_time DATETIME DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_notification_user ON notification(user_id);
+CREATE INDEX IF NOT EXISTS idx_notification_user_unread ON notification(user_id, is_read);
+
+-- Message table: private messages between users
+CREATE TABLE IF NOT EXISTS message (
+    id              INT PRIMARY KEY AUTO_INCREMENT,
+    sender_id       INT NOT NULL,
+    receiver_id     INT NOT NULL,
+    content         TEXT NOT NULL,
+    is_read         BOOLEAN DEFAULT FALSE,
+    create_time     DATETIME DEFAULT CURRENT_TIMESTAMP,
+    conversation_id VARCHAR(50) NOT NULL  -- format: min_max of user IDs
+);
+
+CREATE INDEX IF NOT EXISTS idx_message_receiver ON message(receiver_id);
+CREATE INDEX IF NOT EXISTS idx_message_conversation ON message(conversation_id, create_time);
+CREATE INDEX IF NOT EXISTS idx_message_receiver_unread ON message(receiver_id, is_read);