Revert education feature from main

backend/src/db/schema.ts

@@ -30,9 +30,6 @@ export const ensureSchema = async (database: DatabaseClient = db) => {
     ALTER TABLE workspaces
       DROP CONSTRAINT IF EXISTS workspaces_id_check;
 
-    ALTER TABLE users
-      ADD COLUMN IF NOT EXISTS education_opt_out BOOLEAN NOT NULL DEFAULT FALSE;
-
     ALTER TABLE workspaces
       ADD COLUMN IF NOT EXISTS billing_email VARCHAR(255),
       ADD COLUMN IF NOT EXISTS billing_plan VARCHAR(32) NOT NULL DEFAULT 'household_basic',
@@ -142,37 +139,6 @@ export const ensureSchema = async (database: DatabaseClient = db) => {
     CREATE INDEX IF NOT EXISTS idx_auth_sessions_created_user
       ON auth_sessions (created_at DESC, user_id);
 
-    CREATE TABLE IF NOT EXISTS daily_education (
-      id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
-      publish_date DATE NOT NULL UNIQUE,
-      fact TEXT NOT NULL,
-      quiz_questions JSONB NOT NULL DEFAULT '[]'::jsonb,
-      created_by_user_id UUID REFERENCES users(id) ON DELETE SET NULL,
-      created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
-      updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP
-    );
-
-    ALTER TABLE daily_education
-      ALTER COLUMN quiz_questions SET DEFAULT '[]'::jsonb;
-
-    CREATE INDEX IF NOT EXISTS idx_daily_education_publish_date
-      ON daily_education (publish_date DESC);
-
-    CREATE TABLE IF NOT EXISTS education_question_bank (
-      id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
-      prompt VARCHAR(500) NOT NULL,
-      options JSONB NOT NULL,
-      correct_answer_index INTEGER NOT NULL,
-      explanation VARCHAR(800),
-      created_by_user_id UUID REFERENCES users(id) ON DELETE SET NULL,
-      created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
-      updated_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
-      CHECK (correct_answer_index >= 0 AND correct_answer_index <= 3)
-    );
-
-    CREATE INDEX IF NOT EXISTS idx_education_question_bank_created
-      ON education_question_bank (created_at DESC);
-
     CREATE TABLE IF NOT EXISTS integration_tokens (
       id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
       user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,