base service with authentication and user creation

db/Dockerfile

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+FROM docker.io/library/postgres:15
+
+# Set environment variables
+ENV POSTGRES_USER=chatapp
+ENV POSTGRES_PASSWORD=secret
+ENV POSTGRES_DB=chatapp
+
+# Copy the initialization SQL script
+COPY init.sql /docker-entrypoint-initdb.d/
+COPY mock_data.sql /docker-entrypoint-initdb.d/
+
+# Expose port 5432
+EXPOSE 5432

db/init.sql

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+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
+);

db/mock_data.sql

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+INSERT INTO user (username, password_hash, email) VALUES
+('alice', '$argon2id$v=19$m=19456,t=2,p=1$W0OzC/dmZQt7/xUJt4E9hA$cYiUC91a5yCQU9tDUadw0FKjUmTRv453cYwu1nfMKUQ', 'alice@example.com'),
+('bob', '$argon2id$v=19$m=19456,t=2,p=1$1T7VaQps1X5Wj+TJHt8FIQ$/hA7PSITskjELwfNw+s6BvCJmUA4dDDrSGJvDvHx7Kc', 'bob@example.com'),
+('carol', '$argon2id$v=19$m=19456,t=2,p=1$Kw4Re4lggxzDldu3vNl2PA$6DP4MPftfXI77g8EZRXYmWgcnVnAKLq0dkZOb/eBIC8', 'carol@example.com');
+
+INSERT INTO channel (owner, name) VALUES
+(1, 'General Discussion'),
+(2, 'Tech Talk'),
+(1, 'Random Memes');
+
+INSERT INTO membership (user, channel) VALUES
+(1, 1),  -- Alice in General Discussion
+(2, 1),  -- Bob in General Discussion
+(2, 2),  -- Bob in Tech Talk
+(3, 1),  -- Carol in General Discussion
+(1, 3);  -- Alice in Random Memes
+
+INSERT INTO message (sender, channel, type, content) VALUES
+(1, 1, 'text', 'Hey everyone, hows it going?'),
+(2, 1, 'text', 'All good! Just trying to get through some work.'),
+(3, 1, 'text', 'Hello! How are you guys?'),
+(2, 2, 'text', 'Anyone seen the new tech updates?'),
+(1, 3, 'image', 'Heres a funny meme I found!'),
+(3, 1, 'text', 'I love how active this channel is!');