refactor: ♻️ new limits for database varchars

migrations/20241204225151_create_comment_table.up.sql

@@ -3,5 +3,5 @@ CREATE TABLE IF NOT EXISTS "comment"(
     creation_time TIMESTAMPTZ PRIMARY KEY NOT NULL UNIQUE DEFAULT NOW(),
     post_creation_time TIMESTAMPTZ NOT NULL REFERENCES "post"(creation_time),
     user_id BIGSERIAL NOT NULL REFERENCES "user"(id),
-    comment VARCHAR NOT NULL
+    comment VARCHAR(8192) NOT NULL
 );