cli/db: handle integer foreign keys being null

app/cli/db.py

@@ -43,12 +43,17 @@ def impot(model: db.Model):
             x = model()
             for i in range(len(header)):
                 if header[i] in ["added", "updated", "destroyed", "deprecated", "last_updated", "terraform_updated"]:
+                    # datetime fields
                     if line[i] == "":
                         line[i] = None
                     else:
                         line[i] = datetime.datetime.strptime(line[i], "%Y-%m-%d %H:%M:%S.%f")
-                if header[i] in ["eotk"]:
+                elif header[i] in ["eotk"]:
+                    # boolean fields
                     line[i] = line[i] == "True"
+                elif header[i].endswith("_id") and line[i] == "":
+                    # integer foreign keys
+                    line[i] = None
                 setattr(x, header[i], line[i])
             db.session.add(x)
         db.session.commit()