Added tags table

migrations/2021-09-13-143540_sections/up.sql

@@ -46,7 +46,14 @@ create table versions (
 
     -- This check allows draft posts to be created without having to enter a
     -- publish date, but forces them to have one if they're not a draft.
-    CHECK (is_draft OR publish_date IS NOT NULL)
+    CONSTRAINT no_null_published_date CHECK (is_draft OR publish_date IS NOT NULL)
+);
+
+create table tags (
+    post_id uuid NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
+    value varchar(64) NOT NULL,
+
+    PRIMARY KEY (post_id, value)
 );
 
 create function enforce_version_titles() returns trigger as $$