Add new tables for families management

geneit_backend/migrations/2023-05-24-102711_create_users/down.sql

@@ -1,2 +1,4 @@
 -- This file should undo anything in `up.sql`
-DROP table users;
+DROP table IF EXISTS memberships ;
+DROP table IF EXISTS families;
+DROP table IF EXISTS users;

geneit_backend/migrations/2023-05-24-102711_create_users/up.sql

@@ -1,4 +1,4 @@
--- Create table
+-- Create tables
 CREATE TABLE users (
     id SERIAL PRIMARY KEY,
     name VARCHAR(30) NOT NULL,
@@ -12,4 +12,20 @@ CREATE TABLE users (
     time_activate BIGINT NOT NULL DEFAULT 0,
     active BOOLEAN NOT NULL DEFAULT TRUE,
     admin BOOLEAN NOT NULL DEFAULT FALSE
-)
+);
+
+CREATE TABLE families(
+    id SERIAL PRIMARY KEY,
+    time_create BIGINT NOT NULL,
+    name VARCHAR(30) NOT NULL,
+    invitation_code VARCHAR(7) NOT NULL
+);
+
+CREATE TABLE memberships(
+    user_id integer NOT NULL REFERENCES users,
+    family_id integer NOT NULL REFERENCES families,
+    time_create BIGINT NOT NULL,
+    is_admin BOOLEAN NOT NULL DEFAULT TRUE,
+
+    PRIMARY KEY(user_id, family_id)
+);