feat: restructure sql ingestion

data_platform/helpers/__init__.py

@@ -1,6 +1,15 @@
 """Shared helper utilities."""
 
 import json
+from pathlib import Path
+
+from jinja2 import Environment, FileSystemLoader
+
+
+def render_sql(sql_dir: Path, path: str, **kwargs: object) -> str:
+    """Load and render a Jinja2 SQL template relative to sql_dir."""
+    env = Environment(loader=FileSystemLoader(str(sql_dir)), autoescape=False)
+    return env.get_template(path).render(**kwargs)
 
 
 def safe(val):