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+# Adding Fields to PocketBase Collection Schema
+
+PocketBase silently drops fields not defined in the collection schema — HTTP 200, no error, data just disappears. When you add new fields to the data model, you MUST also add them to the PocketBase schema via API.
+
+## The problem
+
+Services saved with `recommendation` and `explanation` fields appeared to save successfully, but the fields were missing when read back. Root cause: the `services` collection schema only had `name`, `price`, `description`, `category`, `duration` — unknown fields were silently stripped on create/update.
+
+## Detection
+
+Query the collection schema to see current fields:
+
+```python
+# Auth + list collections
+auth = api("POST", "/api/collections/_superusers/auth-with-password", {
+    "identity": "admin@example.com",
+    "password": "password"
+})
+token = auth["token"]
+cols = api("GET", "/api/collections", token=token)
+svc = next(c for c in cols["items"] if c["name"] == "services")
+print([f["name"] for f in svc["fields"]])
+# ['id', 'userId', 'name', 'description', 'price', 'category', ...]
+```
+
+## Fix: PATCH the collection
+
+Add missing fields by PATCHing the complete fields array (including existing fields):
+
+```python
+existing_fields = svc["fields"]
+new_fields = [
+    {"autogeneratePattern":"","hidden":False,"id":"text_rec_new","max":0,"min":0,
+     "name":"recommendation","pattern":"","presentable":False,"primaryKey":False,
+     "required":False,"system":False,"type":"text"},
+    {"autogeneratePattern":"","hidden":False,"id":"text_exp_new","max":0,"min":0,
+     "name":"explanation","pattern":"","presentable":False,"primaryKey":False,
+     "required":False,"system":False,"type":"text"},
+]
+result = api("PATCH", f"/api/collections/{svc['id']}", 
+              {"fields": existing_fields + new_fields}, token=token)
+```
+
+**Important**: You must send the COMPLETE fields array, not just the new fields. PocketBase replaces the entire schema. Each field needs a unique `id` string — use descriptive names like `text_rec_001` or UUIDs.
+
+## Full script
+
+See `scripts/pb_add_fields.py` for a reusable script that auths, lists collections, and adds specified fields.