Remove legacy question storage (#7)

Deletes obsolete question/answer/vote persistence and the compatibility answer endpoint. Existing databases drop the legacy tables through migration 009. Plumber replies now notify the root homeowner even when nested beneath another plumber reply. Post and reply forms prevent duplicate submissions and show progress while posting.

Reviewed-on: #7
Co-authored-by: codegirl-007 <s.raide@gmail.com>

schema.sql

@@ -14,34 +14,6 @@ CREATE UNIQUE INDEX IF NOT EXISTS users_email_lower_uidx
   ON users (lower(email))
   WHERE email <> '';
 
-CREATE TABLE IF NOT EXISTS questions (
-  id TEXT PRIMARY KEY,
-  author_id TEXT NOT NULL REFERENCES users(id),
-  title TEXT NOT NULL,
-  body TEXT NOT NULL,
-  city TEXT NOT NULL DEFAULT '',
-  hunt_date TEXT NOT NULL,
-  hidden INTEGER NOT NULL DEFAULT 0,
-  created_at TEXT NOT NULL
-);
-
-CREATE INDEX IF NOT EXISTS idx_questions_hunt_date ON questions(hunt_date, hidden);
-
-CREATE TABLE IF NOT EXISTS votes (
-  user_id TEXT NOT NULL REFERENCES users(id),
-  question_id TEXT NOT NULL REFERENCES questions(id) ON DELETE CASCADE,
-  value INTEGER NOT NULL CHECK (value IN (-1, 1)),
-  PRIMARY KEY (user_id, question_id)
-);
-
-CREATE TABLE IF NOT EXISTS answers (
-  question_id TEXT PRIMARY KEY REFERENCES questions(id) ON DELETE CASCADE,
-  author_id TEXT NOT NULL REFERENCES users(id),
-  body TEXT NOT NULL,
-  created_at TEXT NOT NULL,
-  updated_at TEXT NOT NULL
-);
-
 CREATE TABLE IF NOT EXISTS posts (
   id TEXT PRIMARY KEY,
   parent_id TEXT REFERENCES posts(id) ON DELETE CASCADE,