added possible-user-tasks

backend/setup.sql

@@ -20,6 +20,14 @@ CREATE TABLE IF NOT EXISTS USERS (
 	CHECK (length(tokenID) = 36)
 );
 
+CREATE TABLE IF NOT EXISTS USER_TASKS (
+	userName varchar(64),
+	taskID INTEGER,
+	PRIMARY KEY (userName, taskID),
+	FOREIGN KEY (userName) REFERENCES USERS(userName) ON DELETE CASCADE ON UPDATE CASCADE,
+	FOREIGN KEY (taskID) REFERENCES TASKS(taskID) ON DELETE CASCADE ON UPDATE CASCADE
+);
+
 CREATE TABLE IF NOT EXISTS EVENTS (
 	eventID INTEGER PRIMARY KEY,
 	date DATETIME NOT NULL,