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backend-node/init.sql

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+-- PostgreSQL schema initialization for core models
+-- Derived from Sequelize models: User, Group, Friendship, FriendRequest, and the User<->Group join table
+
+-- Drop tables in dependency order
+DROP TABLE IF EXISTS "UserGroups" CASCADE;
+DROP TABLE IF EXISTS friend_requests CASCADE;
+DROP TABLE IF EXISTS friendships CASCADE;
+DROP TABLE IF EXISTS groups CASCADE;
+DROP TABLE IF EXISTS users CASCADE;
+
+-- users table
+CREATE TABLE users (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(255) NOT NULL,
+  "email" VARCHAR(255) NOT NULL UNIQUE,
+  "avatarUrl" VARCHAR(255) NOT NULL,
+  score INTEGER NOT NULL DEFAULT 0
+);
+
+-- groups table
+CREATE TABLE groups (
+  id SERIAL PRIMARY KEY,
+  name VARCHAR(255) NOT NULL
+);
+
+-- friendships table
+-- In-model hook ensures user1Id < user2Id at application level; we also add a DB check for safety.
+CREATE TABLE friendships (
+  id SERIAL PRIMARY KEY,
+  "user1Id" INTEGER NOT NULL,
+  "user2Id" INTEGER NOT NULL,
+  CONSTRAINT friendships_user_order_chk CHECK ("user1Id" < "user2Id"),
+  CONSTRAINT friendships_user_pair_uniq UNIQUE ("user1Id", "user2Id"),
+  CONSTRAINT friendships_user1_fk FOREIGN KEY ("user1Id") REFERENCES users(id) ON DELETE CASCADE,
+  CONSTRAINT friendships_user2_fk FOREIGN KEY ("user2Id") REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- friend_requests table (with Sequelize default timestamps)
+CREATE TABLE friend_requests (
+  id SERIAL PRIMARY KEY,
+  status VARCHAR(50) NOT NULL DEFAULT 'PENDING',
+  "fromUserId" INTEGER NOT NULL,
+  "toUserId" INTEGER NOT NULL,
+  "createdAt" TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  "updatedAt" TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  CONSTRAINT friend_requests_from_fk FOREIGN KEY ("fromUserId") REFERENCES users(id) ON DELETE CASCADE,
+  CONSTRAINT friend_requests_to_fk FOREIGN KEY ("toUserId") REFERENCES users(id) ON DELETE CASCADE
+);
+
+-- Optional: keep updatedAt current via trigger (Sequelize usually updates it in app code)
+-- You can uncomment the below if you want DB-side auto update
+-- CREATE OR REPLACE FUNCTION set_updated_at()
+-- RETURNS TRIGGER AS $$
+-- BEGIN
+--   NEW."updatedAt" = NOW();
+--   RETURN NEW;
+-- END;
+-- $$ LANGUAGE plpgsql;
+-- CREATE TRIGGER friend_requests_set_updated_at
+-- BEFORE UPDATE ON friend_requests
+-- FOR EACH ROW
+-- EXECUTE FUNCTION set_updated_at();
+
+-- User <-> Group many-to-many join table
+CREATE TABLE "UserGroups" (
+  "userId" INTEGER NOT NULL,
+  "groupId" INTEGER NOT NULL,
+  CONSTRAINT usergroups_user_fk FOREIGN KEY ("userId") REFERENCES users(id) ON DELETE CASCADE,
+  CONSTRAINT usergroups_group_fk FOREIGN KEY ("groupId") REFERENCES groups(id) ON DELETE CASCADE,
+  CONSTRAINT usergroups_user_group_uniq UNIQUE ("userId", "groupId")
+);
+
+-- Helpful indexes
+CREATE INDEX IF NOT EXISTS idx_friend_requests_from ON friend_requests ("fromUserId");
+CREATE INDEX IF NOT EXISTS idx_friend_requests_to ON friend_requests ("toUserId");
+CREATE INDEX IF NOT EXISTS idx_friendships_user1 ON friendships ("user1Id");
+CREATE INDEX IF NOT EXISTS idx_friendships_user2 ON friendships ("user2Id");