chore: import upstream snapshot with attribution

2026-07-13 13:32:57 +08:00
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+# TSQL (TriggerSQL)
+
+TriggerSQL is a DSL that is safely converted into ClickHouse SQL queries with protection against SQL injection and it's tenant-safe (users can only query their own data).
+
+## Attribution
+
+This package is derived from [PostHog's HogQL](https://github.com/PostHog/posthog/tree/master/posthog/hogql) (MIT License). See [NOTICE.md](./NOTICE.md) for the full copyright notice.
+
+## ANTLR Grammar
+
+The ANTLR grammar is heavily inspired by PostHog's HogQL.
+
+These are found in [./src/grammar](./src/grammar) and are the `.g4` files.
+
+## Generating the source code
+
+```sh
+pnpm run grammar:build
+```