fix: handle chembl approval enum oddities

therapy/etl/chembl.py

@@ -52,6 +52,7 @@ def _unwrap_group_concat(value: Optional[str]) -> List[str]:
     @staticmethod
     def _get_approval_rating(value: Optional[float]) -> Optional[ApprovalRating]:
         """Standardize approval rating value
+
         :param value: value retrieved from ChEMBL database
         :return: instantiated ApprovalRating
         :raise: ValueError if invalid value is provided
@@ -106,7 +107,6 @@ def _get_indications(self, value: Optional[str]) -> List[Dict]:
                     indication = {
                         "disease_id": ind_group[0],
                         "disease_label": ind_group[2],
-                        "supplemental_info": {"chembl_max_phase_for_ind": phase},
                     }
                     if phase is not None:
                         indication["supplemental_info"] = {

therapy/schemas.py

@@ -40,6 +40,15 @@ class ApprovalRating(str, Enum):
     ulcer at Phase 3, and also liver disease at Phase 1. "
      - CHEMBL_4: "A marketed drug e.g. AMINOPHYLLINE (CHEMBL1370561) is an FDA
     approved drug for treatment of asthma. "
+     - CHEMBL_WITHDRAWN: "A withdrawn drug is an approved drug contained in a medicinal
+    product that subsequently had been removed from the market. The reasons for
+    withdrawal may include toxicity, lack of efficacy, or other reasons such as an
+    unfavorable risk-to-benefit ratio following approval and marketing of the drug.
+    ChEMBL considers an approved drug to be withdrawn only if all medicinal products
+    that contain the drug as an active ingredient have been withdrawn from one (or more)
+    regions of the world. Note that all medicinal products for a drug can be withdrawn
+    in one region of the world while still being marketed in other jurisdictions."
+    https://pubs.acs.org/doi/10.1021/acs.chemrestox.0c00296
 
     Drugs@FDA:
      - FDA_PRESCRIPTION: "A prescription drug product requires a doctor's authorization