Have got post creation working.

sql/schema/1_init.up.sql

@@ -1,8 +1,26 @@
+CREATE TYPE post_state AS ENUM (
+    'draft',
+    'published'
+);
+
 CREATE TABLE site (
     id    BIGSERIAL NOT NULL PRIMARY KEY,
-    name  TEXT NOT NULL UNIQUE,
-    title TEXT NOT NULL,
-    url   TEXT NOT NULL,
-    theme TEXT NOT NULL,
-    props JSON NOT NULL
+    name  TEXT      NOT NULL UNIQUE,
+    title TEXT      NOT NULL,
+    url   TEXT      NOT NULL,
+    theme TEXT      NOT NULL,
+    props JSON      NOT NULL
 );
+
+CREATE TABLE post (
+    id         BIGSERIAL  NOT NULL PRIMARY KEY,
+    site_id    BIGINT     NOT NULL,
+    title      TEXT,
+    body       TEXT       NOT NULL,
+    state      post_state NOT NULL,
+    props      JSON       NOT NULL,
+    post_date  TIMESTAMP WITH TIME ZONE,
+    created_at TIMESTAMP  NOT NULL,
+
+    FOREIGN KEY (site_id) REFERENCES site(id)
+);