delete IF NOT EXISTS in create table sql queries

migrations/0000.initial_schema.py

@@ -1,17 +1,17 @@
 from yoyo import step
 
 steps = [
-    step('CREATE TABLE IF NOT EXISTS users (id SERIAL PRIMARY KEY, telegram_id INTEGER NOT NULL UNIQUE)'),
-    step('CREATE TABLE IF NOT EXISTS feeds (id SERIAL PRIMARY KEY, url TEXT NOT NULL UNIQUE)'),
+    step('CREATE TABLE users (id SERIAL PRIMARY KEY, telegram_id INTEGER NOT NULL UNIQUE)'),
+    step('CREATE TABLE feeds (id SERIAL PRIMARY KEY, url TEXT NOT NULL UNIQUE)'),
     step(
-        'CREATE TABLE IF NOT EXISTS subscriptions ('
+        'CREATE TABLE subscriptions ('
         '   user_id INTEGER REFERENCES users,'
         '   feed_id INTEGER REFERENCES feeds,'
         '   UNIQUE (user_id, feed_id)'
         ')'
     ),
     step(
-        'CREATE TABLE IF NOT EXISTS feeds_last_items ('
+        'CREATE TABLE feeds_last_items ('
         '   feed_id INTEGER REFERENCES feeds ON DELETE CASCADE,'
         '   url TEXT NOT NULL,'
         '   guid TEXT'