created setup and backend structure

setup/setup.sql

@@ -0,0 +1,44 @@
+CREATE TABLE TASKS (
+  id INTEGER PRIMARY KEY AUTO_INCREMENT,
+  text varchar(64) NOT NULL,
+  disabled BOOL DEFAULT(false)
+);
+
+CREATE TABLE AVAILABILITIES (
+  id INTEGER PRIMARY KEY AUTO_INCREMENT,
+  text varchar(32) NOT NULL,
+  disabled BOOL DEFAULT(false)
+);
+
+CREATE TABLE USERS (
+  id INTEGER PRIMARY KEY AUTO_INCREMENT,
+  name varchar(64) NOT NULL,
+  password binary(60) NOT NULL,
+  admin BOOL NOT NULL DEFAULT(false)
+);
+
+CREATE TABLE EVENTS (
+  id INTEGER PRIMARY KEY AUTO_INCREMENT,
+  date DATETIME NOT NULL,
+  description TEXT DEFAULT("")
+);
+
+CREATE TABLE USER_AVAILABILITIES (
+  userID INTEGER NOT NULL,
+  eventID INTEGER NOT NULL,
+  availabilityID INTEGER NOT NULL,
+  PRIMARY KEY (userID, eventID),
+  FOREIGN KEY (userID) REFERENCES USERS(id) ON DELETE CASCADE,
+  FOREIGN KEY (eventID) REFERENCES EVENTS(id) ON DELETE CASCADE,
+  FOREIGN KEY (avaibID) REFERENCES AVAILABILITIES(id) ON DELETE RESTRICT,
+);
+
+CREATE TABLE USER_ASSIGNMENTS (
+  eventID INTEGER NOT NULL,
+  taskID INTEGER NOT NULL,
+  userID INTEGER NOT NULL,
+  PRIMARY KEY (eventID, taskID),
+  FOREIGN KEY (userID) REFERENCES USERS(id) ON DELETE CASCADE,
+  FOREIGN KEY (taskID) REFERENCES TASKS(id) ON DELETE RESTRICT,
+  FOREIGN KEY (eventID) REFERENCES EVENTS(id) ON DELETE CASCADE
+);