Create README.md

Author: franks883

Server-Side Components/Script Includes/Safe Bulk Update Runner/README.md

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+# Safe Bulk Update Runner (auto-throttled)
+
+## Use case
+Run large backfills/hygiene tasks without timeouts or instance impact. Instead of one risky long transaction, process records in chunks and automatically schedule the next slice.
+
+## Where to use it
+- Script Include invoked from Background Script, on-demand Scheduled Job, or Flow Action wrapper.
+
+## How it works
+- Queries a time-boxed chunk (e.g., 40 seconds, 500 rows).
+- Executes a caller-supplied per-record function.
+- Saves a checkpoint (`sys_id`) in a system property.
+- Uses `ScheduleOnce` to queue the next slice (no `gs.sleep`).
+
+## Configuration
+- Target table, encoded query, orderBy field (default `sys_id`)
+- Chunk size, max execution seconds
+- Property name for checkpoint