Added original migrations

migrations/2022-01-02-195433_users-and-jwt/down.sql

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+-- This file should undo anything in `up.sql`
+drop table refresh_tokens cascade;
+drop table users cascade;

migrations/2022-01-02-195433_users-and-jwt/up.sql

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+CREATE TABLE users (
+    id uuid DEFAULT gen_random_uuid() PRIMARY KEY,
+
+    username varchar(32) UNIQUE NOT NULL,
+    -- Hashed + salted representation of the username
+    password text NOT NULL,
+    -- Wether the user is currently blocked
+    blocked boolean NOT NULL DEFAULT false
+);
+
+CREATE TABLE refresh_tokens (
+    -- This is more efficient than storing the text
+    token bytea PRIMARY KEY,
+    -- The user for whom the token was created
+    user_id uuid NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+    -- When the token expires
+    expires_at timestamp NOT NULL,
+    -- When the token was last used (is NULL until used)
+    last_used_at timestamp
+);