internal/postgres: remove some error logging

We were logging some information to debug a deadlock, but it was
cluttering the logs and the messages had no context viewed in
isolation. Instead just log one row.

Change-Id: I0c7c261af0371f12edf51102a0b6ec20daf4bc9b
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/348932
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>

internal/postgres/insert_module.go

diff --git a/internal/postgres/insert_module.go b/internal/postgres/insert_module.go
index c253e99..7c8c08e 100644
--- a/internal/postgres/insert_module.go
+++ b/internal/postgres/insert_module.go
@@ -497,10 +497,7 @@
 			pathIDToUnitID[pathID] = unitID
 			return nil
 		}); err != nil {
-		log.Errorf(ctx, "got error doing bulk upsert to units (see below); logging path_id, module_id for golang.org/issue/43899")
-		for i := 0; i < len(unitValues); i += len(unitCols) {
-			log.Errorf(ctx, "%v, %v", unitValues[i], unitValues[i+1])
-		}
+		log.Errorf(ctx, "got error doing bulk upsert to units (see below); logging one path_id, module_id for golang.org/issue/43899: %v, %v", unitValues[0], unitValues[1])
 		return nil, err
 	}
 	return pathIDToUnitID, nil