ch17.2

migrations/000006_add_permissions.down.sql

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+DROP TABLE IF EXISTS users_permissions;
+DROP TABLE IF EXISTS permissions;

migrations/000006_add_permissions.up.sql

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+CREATE TABLE IF NOT EXISTS permissions (
+    id bigserial PRIMARY KEY,
+    code text NOT NULL
+);
+
+CREATE TABLE IF NOT EXISTS users_permissions (
+    user_id bigint NOT NULL REFERENCES users ON DELETE CASCADE,
+    permission_id bigint NOT NULL REFERENCES permissions ON DELETE CASCADE,
+    PRIMARY KEY (user_id, permission_id)
+);
+
+INSERT INTO permissions (code)
+VALUES
+    ('movies:read'),
+    ('movies:write');