Implement migration

PostText.pl

@@ -34,4 +34,6 @@ get '/view', sub ($c) {
 
 app->secrets(app->config->{'secrets'}) || die $@;
 
+app->pg->migrations->from_dir('migrations')->migrate();
+
 app->start();

migrations/1/down.sql

@@ -0,0 +1 @@
+DROP TABLE threads;

migrations/1/up.sql

@@ -0,0 +1,9 @@
+CREATE TABLE IF NOT EXISTS threads (
+         thread_id SERIAL PRIMARY KEY,
+       thread_date TIMESTAMPTZ DEFAULT now(),
+     thread_author VARCHAR(64),
+      thread_title VARCHAR(256),
+       thread_body VARCHAR(4096),
+     hidden_status BOOLEAN NOT NULL,
+    flagged_status BOOLEAN NOT NULL
+);