base service with authentication and user creation

db/init.sql

@@ -0,0 +1,26 @@
+CREATE TABLE IF NOT EXISTS user (
+    id SERIAL PRIMARY KEY,
+    email TEXT UNIQUE,
+    username TEXT NOT NULL UNIQUE,
+    password_hash TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS channel (
+    id SERIAL PRIMARY KEY,
+    owner INT NOT NULL REFERENCES user(id) ON DELETE CASCADE,
+    name TEXT NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS membership (
+  user INT REFERENCES user(id),
+  channel INT REFERENCES channel(id),
+  PRIMARY KEY (user, channel)
+);
+
+CREATE TABLE IF NOT EXISTS message (
+  id BIGSERIAL PRIMARY KEY,
+  sender INT REFERENCES user(id) NOT NULL,
+  channel INT REFERENCES channel(id) NOT NULL,
+  type VARCHAR(32) NOT NULL,
+  content TEXT NOT NULL
+);