diff --git a/.gitignore b/.gitignore
index e019059..6749752 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
 *.db
-*.json
 .idea/
 *.csv
\ No newline at end of file
diff --git a/schema.json b/schema.json
new file mode 100644
index 0000000..8987584
--- /dev/null
+++ b/schema.json
@@ -0,0 +1,55 @@
+{
+  "flat_keys": [
+    "cost_center",
+    "location",
+    "customer",
+    "event"
+  ],
+  "extract_keys": {
+    "customer.addresses": {
+      "flat_keys": [],
+      "extract_keys": {}
+    },
+    "customer.phone_numbers": {
+      "flat_keys": [],
+      "extract_keys": {}
+    },
+    "price_modifiers": {
+      "flat_keys": [],
+      "extract_keys": {}
+    },
+    "tender_items": {
+      "flat_keys": [],
+      "extract_keys": {}
+    },
+    "fee_items": {
+      "flat_keys": [],
+      "extract_keys": {}
+    },
+    "tax_items": {
+      "flat_keys": [],
+      "extract_keys": {}
+    },
+    "loyalty": {
+      "flat_keys": [],
+      "extract_keys": {}
+    },
+    "sale_items": {
+      "flat_keys": [],
+      "extract_keys": {
+        "categories": {
+          "key": "categories"
+        },
+        "modifiers": {
+          "key": "modifiers",
+          "flat_keys": [],
+          "extract_keys": {
+            "categories": {
+              "key": "categories"
+            }
+          }
+        }
+      }
+    }
+  }
+}
\ No newline at end of file