Wrap background tasks in try/except

mwmbl/background.py

@@ -1,15 +1,28 @@
 """
 Script that updates data in a background process.
 """
+from logging import getLogger
+
 from mwmbl.indexer import historical
 from mwmbl.indexer.preprocess import run_preprocessing
 from mwmbl.indexer.retrieve import retrieve_batches
 from mwmbl.indexer.update_pages import run_update
 
+logger = getLogger(__name__)
+
 
 def run(index_path: str):
     historical.run()
     while True:
-        retrieve_batches()
-        run_preprocessing(index_path)
-        run_update(index_path)
+        try:
+            retrieve_batches()
+        except Exception:
+            logger.exception("Error retrieving batches")
+        try:
+            run_preprocessing(index_path)
+        except Exception:
+            logger.exception("Error preprocessing")
+        try:
+            run_update(index_path)
+        except Exception:
+            logger.exception("Error running index update")