Comment model

migrations/2018-05-09-192013_create_comments/down.sql

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+-- This file should undo anything in `up.sql`
+DROP TABLE comments;

migrations/2018-05-09-192013_create_comments/up.sql

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+-- Your SQL goes here
+CREATE TABLE comments (
+    id SERIAL PRIMARY KEY,
+    content TEXT NOT NULL DEFAULT '',
+    in_response_to_id INTEGER REFERENCES comments(id),    
+    post_id INTEGER REFERENCES posts(id) ON DELETE CASCADE NOT NULL,
+    author_id INTEGER REFERENCES users(id) ON DELETE CASCADE NOT NULL,
+    creation_date TIMESTAMP NOT NULL DEFAULT now(),
+    ap_url VARCHAR,
+    sensitive BOOLEAN NOT NULL DEFAULT 'f',
+    spoiler_text TEXT NOT NULL DEFAULT ''
+)