Initial build out

tests/test_db_schema.py

@@ -0,0 +1,22 @@
+def test_tables_created(db_conn):
+    tables = db_conn.execute(
+        "SELECT table_name FROM information_schema.tables WHERE table_schema = 'main'"
+    ).fetchall()
+    table_names = {t[0] for t in tables}
+    expected = {
+        "raw_institution",
+        "raw_ipeds_finance",
+        "raw_ipeds_staff",
+        "raw_ipeds_enrollment",
+        "raw_990_filing",
+        "raw_990_schedule_j",
+        "raw_990_part_vii",
+        "raw_cpi_u",
+    }
+    assert expected.issubset(table_names)
+
+
+def test_schema_idempotent(db_conn):
+    """Calling ensure_schema twice should not raise."""
+    from admin_analytics.db.schema import ensure_schema
+    ensure_schema(db_conn)  # already called in fixture; second call should be fine