Query
CREATE TABLE voice_agent_instance_connections (
id INTEGER PRIMARY KEY AUTOINCREMENT,
voice_agent_config_id INTEGER NOT NULL,
instance_id INTEGER NOT NULL,
created_at TEXT NOT NULL,
FOREIGN KEY (voice_agent_config_id) REFERENCES voice_agent_configs(id) ON DELETE CASCADE,
FOREIGN KEY (instance_id) REFERENCES evolution_instances(id) ON DELETE CASCADE,
UNIQUE(voice_agent_config_id, instance_id)
)