Drop text indices on the failureline table

treeherder/model/migrations/0029_alter_failureline_index_together.py

@@ -0,0 +1,22 @@
+# Generated by Django 4.1.9 on 2023-08-28 11:32
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+    """
+    Drop indices on the Failure Line table as test and subtest
+    entries are too large compared to PostgreSQL limitations.
+    https://www.postgresql.org/docs/15/textsearch-limitations.html
+    """
+
+    dependencies = [
+        ('model', '0028_alter_textlogerror_unique_together'),
+    ]
+
+    operations = [
+        migrations.AlterIndexTogether(
+            name='failureline',
+            index_together={('job_guid', 'repository')},
+        ),
+    ]

treeherder/model/models.py

@@ -955,13 +955,7 @@ class FailureLine(models.Model):
 
     class Meta:
         db_table = 'failure_line'
-        index_together = (
-            ('job_guid', 'repository'),
-            # Prefix index: test(50), subtest(25), status, expected, created
-            ('test', 'subtest', 'status', 'expected', 'created'),
-            # Prefix index: signature(25), test(50), created
-            ('signature', 'test', 'created'),
-        )
+        index_together = (('job_guid', 'repository'),)
         unique_together = ('job_log', 'line')
 
     def __str__(self):