Feat: Add syntax highlighting for a lot more languages

samples/sql.sql

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+-- Sample SQL to exercise the highlight rules
+
+-- DDL
+CREATE TEMPORARY TABLE IF NOT EXISTS public.users (
+  user_id BIGSERIAL PRIMARY KEY,
+  email VARCHAR(255) UNIQUE NOT NULL,
+  profile JSONB,
+  balance DECIMAL(12,2) DEFAULT 0.00,
+  created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
+  updated_at TIMESTAMPTZ,
+  CONSTRAINT email_chk CHECK (email LIKE '%@%')
+);
+
+-- Indexes
+CREATE INDEX CONCURRENTLY IF NOT EXISTS users_email_idx ON public.users USING btree (email);
+CREATE INDEX IF NOT EXISTS users_profile_gin_idx ON public.users USING gin (profile);
+
+-- Insert & returning
+INSERT INTO public.users (email, profile, balance)
+VALUES
+  ('alice@example.com', '{"plan":"pro","tags":["a","b"]}'::jsonb, 25.50),
+  ('bob@example.com',   '{"plan":"free","tags":["c"]}'::jsonb,   0.00)
+RETURNING user_id, email, profile;
+
+-- Update with CASE and CAST
+UPDATE public.users u
+SET balance = balance + CAST(5 AS DECIMAL),
+    updated_at = CURRENT_TIMESTAMP,
+    profile = jsonb_set(profile, '{last_seen}', to_jsonb(CURRENT_TIMESTAMP)),
+    email = CASE
+              WHEN email LIKE '%@example.com' THEN replace(email, '@example.com', '@example.org')
+              ELSE email
+            END
+WHERE u.balance >= 0
+RETURNING user_id, email, balance;
+
+-- Delete with USING
+DELETE FROM public.users AS u
+USING public.users AS t
+WHERE u.user_id = t.user_id
+  AND u.email LIKE 'bob@%';
+
+-- Window, CTE, aggregates
+WITH recent AS (
+  SELECT *
+  FROM public.users
+  WHERE created_at > NOW() - INTERVAL '30 days'
+)
+SELECT
+  user_id,
+  email,
+  balance,
+  SUM(balance) OVER (PARTITION BY 1 ORDER BY created_at ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) AS running_total,
+  ROW_NUMBER() OVER (ORDER BY created_at DESC) AS rn
+FROM recent
+ORDER BY created_at DESC
+LIMIT 50 OFFSET 0;
+
+-- Joins and JSON
+CREATE TEMP TABLE events (
+  event_id BIGSERIAL PRIMARY KEY,
+  user_id BIGINT REFERENCES public.users(user_id),
+  payload JSONB,
+  created_at TIMESTAMPTZ DEFAULT NOW()
+);
+
+INSERT INTO events (user_id, payload) VALUES
+  (1, '{"type":"login","ip":"127.0.0.1"}'),
+  (1, '{"type":"purchase","amount":9.99,"items":[{"sku":"A1","qty":1}]}' ),
+  (2, '{"type":"login","ip":"10.0.0.2"}');
+
+SELECT u.email, e.payload->>'type' AS event_type, e.payload
+FROM public.users u
+LEFT JOIN events e ON e.user_id = u.user_id
+WHERE e.payload ? 'type'
+ORDER BY e.created_at DESC;
+
+-- Transaction control
+BEGIN;
+  UPDATE public.users SET balance = balance - 5 WHERE email LIKE 'alice%';
+  INSERT INTO events (user_id, payload)
+  SELECT user_id, jsonb_build_object('type','adjust','delta',-5) FROM public.users WHERE email LIKE 'alice%';
+COMMIT;