Improve human readabilty of output: print how long it took to apply h…

…ow many changes, and print the rate

scripts/osm2pgsql-replication

@@ -365,6 +365,7 @@ def update(conn, args):
             return 1
 
         base_url, seq, ts = cur.fetchone()
+        initial_local_timestamp = ts
         LOG.info("Using replication service '%s'.", base_url)
         local_db_age_sec = int((dt.datetime.now(dt.timezone.utc) - ts).total_seconds())
         LOG.info("Local database is at sequence %d, which is data up until %s ago (%d seconds ago, %s).",
@@ -396,6 +397,8 @@ def update(conn, args):
             int((current.timestamp - ts).total_seconds()),
             )
 
+    update_started = dt.datetime.now(dt.timezone.utc)
+
     if args.diff_file is not None:
         outfile = Path(args.diff_file)
     else:
@@ -454,6 +457,23 @@ def update(conn, args):
         if args.once:
             break
 
+
+    update_duration_sec = (dt.datetime.now(dt.timezone.utc) - update_started).total_seconds()
+    with conn.cursor() as cur:
+        cur.execute(sql.SQL('SELECT * FROM {}').format(args.table))
+        if cur.rowcount != 1:
+            LOG.fatal("Updates not set up correctly. Run 'osm2pgsql-updates init' first.")
+            return 1
+
+        _base_url, _seq, current_local_timestamp = cur.fetchone()
+
+    total_applied_changes_duration_sec = (current_local_timestamp - initial_local_timestamp).total_seconds()
+    LOG.info("It took %s (%d sec) to apply %s (%d sec) of changes. This is a speed of ×%.1f.",
+            pretty_format_timedelta(update_duration_sec), int(update_duration_sec),
+            pretty_format_timedelta(total_applied_changes_duration_sec), int(total_applied_changes_duration_sec),
+            total_applied_changes_duration_sec / update_duration_sec
+        )
+
     return 0
 
 def get_parser():