Add some logging around constant injection

src/cal_tools/constants.py

 import binascii
+import logging
 import time
 from dataclasses import asdict, dataclass
-
 from datetime import datetime, timezone
 from hashlib import md5
 from pathlib import Path
@@ -21,6 +21,8 @@ from cal_tools.calcat_interface2 import (
 
 CONDITION_NAME_MAX_LENGTH = 60
 
+log = logging.getLogger(__name__)
+
 
 class InjectionError(Exception):
     ...
@@ -80,7 +82,7 @@ def create_unique_cc_name(det_type, calibration, condition_name):
 
 def create_unique_ccv_name(start_idx):
     # Generate unique name if it doesn't exist
-    datetime_str = datetime_str = datetime.now(
+    datetime_str = datetime.now(
         timezone.utc).strftime('%Y%m%d_%H%M%S')
     return f'{datetime_str}_sIdx={start_idx}'
 
@@ -243,11 +245,13 @@ def get_or_create_calibration_constant(
         cc_id = client.get(
             f"calibrations/{cal_id}/get_calibration_constant",
             calibration_constant
-        )
+        )['id']
+        log.debug("Retrieved existing calibration constant ID %s", cc_id)
     except CalCatAPIError as e:
         if e.status_code != 404:
             raise
         cc_id = client.post("calibration_constants", calibration_constant)['id']
+        log.debug("Created calibration constant ID %s", cc_id)
     return cc_id
 
 
@@ -344,6 +348,7 @@ def inject_ccv(const_src, ccv_root, report_to=None, client=None):
     try:
         condition_id, condition_name = create_condition(
             client, detector_type, pdu_name, pdu_uuid, cond_params)
+        log.debug("Condition ID: %s & name: %r", condition_id, condition_name)
 
         # Create Calibration Constant in database, if not available.
         cc_id = get_or_create_calibration_constant(
@@ -360,6 +365,7 @@ def inject_ccv(const_src, ccv_root, report_to=None, client=None):
                 description="",
             ))
             report_id = resp['id']
+            log.debug("CalCat report ID: %s", report_id)
 
         # Get PDU ID before creating new CCV.
         pdu_id = client.pdu_by_name(pdu_name)['id']