diff --git a/src/lib/Hydra/Schema/Jobs.pm b/src/lib/Hydra/Schema/Jobs.pm
index d4126e32..b00f3e0f 100644
--- a/src/lib/Hydra/Schema/Jobs.pm
+++ b/src/lib/Hydra/Schema/Jobs.pm
@@ -51,7 +51,7 @@ __PACKAGE__->table("jobs");
 
   data_type: 'integer'
   is_foreign_key: 1
-  is_nullable: 1
+  is_nullable: 0
 
 =head2 name
 
@@ -66,7 +66,7 @@ __PACKAGE__->add_columns(
   "jobset",
   { data_type => "text", is_foreign_key => 1, is_nullable => 0 },
   "jobset_id",
-  { data_type => "integer", is_foreign_key => 1, is_nullable => 1 },
+  { data_type => "integer", is_foreign_key => 1, is_nullable => 0 },
   "name",
   { data_type => "text", is_nullable => 0 },
 );
@@ -139,12 +139,7 @@ __PACKAGE__->belongs_to(
   "jobset",
   "Hydra::Schema::Jobsets",
   { id => "jobset_id" },
-  {
-    is_deferrable => 0,
-    join_type     => "LEFT",
-    on_delete     => "CASCADE",
-    on_update     => "NO ACTION",
-  },
+  { is_deferrable => 0, on_delete => "CASCADE", on_update => "NO ACTION" },
 );
 
 =head2 jobset_project_jobset
@@ -197,7 +192,7 @@ __PACKAGE__->has_many(
 );
 
 
-# Created by DBIx::Class::Schema::Loader v0.07049 @ 2020-02-06 12:30:58
-# DO NOT MODIFY THIS OR ANYTHING ABOVE! md5sum:dFusVjxb423gIEoadAw9sw
+# Created by DBIx::Class::Schema::Loader v0.07049 @ 2020-02-06 12:33:28
+# DO NOT MODIFY THIS OR ANYTHING ABOVE! md5sum:C5Tyh8Ke4yC6q7KIFVOHcQ
 
 1;
diff --git a/src/sql/hydra.sql b/src/sql/hydra.sql
index 8349e3be..f6c05bf7 100644
--- a/src/sql/hydra.sql
+++ b/src/sql/hydra.sql
@@ -146,7 +146,7 @@ create table JobsetInputAlts (
 create table Jobs (
     project       text not null,
     jobset        text not null,
-    jobset_id     integer null,
+    jobset_id     integer not null,
     name          text not null,
 
     primary key   (project, jobset, name),
diff --git a/src/sql/upgrade-63.sql b/src/sql/upgrade-63.sql
new file mode 100644
index 00000000..a7476e68
--- /dev/null
+++ b/src/sql/upgrade-63.sql
@@ -0,0 +1,7 @@
+-- Make the Jobs.jobset_id column NOT NULL. If this upgrade fails,
+-- either the admin didn't run the backfiller or there is a bug. If
+-- the admin ran the backfiller and there are null columns, it is
+-- very important to figure out where the nullable columns came from.
+
+ALTER TABLE Jobs
+  ALTER COLUMN jobset_id SET NOT NULL;