base service with authentication and user creation

db/mock_data.sql

@@ -0,0 +1,24 @@
+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!');