Query
CREATE TABLE owner_unanswered_reminders_sent (
id INTEGER PRIMARY KEY AUTOINCREMENT,
chatbot_id INTEGER NOT NULL,
conversation_id INTEGER NOT NULL,
last_user_message_id INTEGER NOT NULL,
sent_at TEXT NOT NULL,
status TEXT DEFAULT 'sent',
FOREIGN KEY (chatbot_id) REFERENCES chatbots(id) ON DELETE CASCADE,
FOREIGN KEY (conversation_id) REFERENCES conversations(id) ON DELETE CASCADE,
UNIQUE(chatbot_id, conversation_id, last_user_message_id)
)