diff --git a/db/post_migrate/20230214154101_fix_partition_ids_on_ci_sources_pipelines.rb b/db/post_migrate/20230214154101_fix_partition_ids_on_ci_sources_pipelines.rb
new file mode 100644
index 0000000000000000000000000000000000000000..c05b759c2d04388b8929af1d7f1f1b3953362de7
--- /dev/null
+++ b/db/post_migrate/20230214154101_fix_partition_ids_on_ci_sources_pipelines.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+class FixPartitionIdsOnCiSourcesPipelines < Gitlab::Database::Migration[2.1]
+  disable_ddl_transaction!
+  restrict_gitlab_migration gitlab_schema: :gitlab_ci
+
+  BATCH_SIZE = 50
+
+  def up
+    return unless Gitlab.com?
+
+    model = define_batchable_model(:ci_sources_pipelines)
+
+    batch_update_records(model, :partition_id, from: 101, to: 100, source_partition_id: 100)
+    batch_update_records(model, :source_partition_id, from: 101, to: 100)
+  end
+
+  def down
+    # no-op
+  end
+
+  private
+
+  def batch_update_records(model, column, from:, to:, **updates)
+    updates.reverse_merge!(column => to)
+
+    model
+      .where(model.arel_table[column].eq(from))
+      .each_batch(of: BATCH_SIZE) { |batch| update_records(batch, updates) }
+  end
+
+  def update_records(relation, updates)
+    relation.update_all(updates)
+    sleep 0.1
+  end
+end
diff --git a/db/schema_migrations/20230214154101 b/db/schema_migrations/20230214154101
new file mode 100644
index 0000000000000000000000000000000000000000..97ea6dfb25919d735b7898fe0c2a82747866f8ca
--- /dev/null
+++ b/db/schema_migrations/20230214154101
@@ -0,0 +1 @@
+89f5c87983f2739ad20f1f3f3542aea5cd9373879d399835207028792e1e097c
\ No newline at end of file
diff --git a/spec/migrations/20230214154101_fix_partition_ids_on_ci_sources_pipelines_spec.rb b/spec/migrations/20230214154101_fix_partition_ids_on_ci_sources_pipelines_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..44031175497259a913960da7a0a73a708b4ea627
--- /dev/null
+++ b/spec/migrations/20230214154101_fix_partition_ids_on_ci_sources_pipelines_spec.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require_migration!
+
+RSpec.describe FixPartitionIdsOnCiSourcesPipelines, migration: :gitlab_ci, feature_category: :continuous_integration do
+  let(:sources_pipelines) { table(:ci_sources_pipelines, database: :ci) }
+
+  before do
+    sources_pipelines.insert_all!([
+      { partition_id: 100, source_partition_id: 100 },
+      { partition_id: 100, source_partition_id: 101 },
+      { partition_id: 101, source_partition_id: 100 },
+      { partition_id: 101, source_partition_id: 101 }
+    ])
+  end
+
+  describe '#up' do
+    context 'when on sass' do
+      before do
+        allow(Gitlab).to receive(:com?).and_return(true)
+      end
+
+      it 'fixes partition_id and source_partition_id' do
+        expect { migrate! }.not_to raise_error
+
+        expect(sources_pipelines.where(partition_id: 100).count).to eq(4)
+        expect(sources_pipelines.where(partition_id: 101).count).to eq(0)
+        expect(sources_pipelines.where(source_partition_id: 100).count).to eq(4)
+        expect(sources_pipelines.where(source_partition_id: 101).count).to eq(0)
+      end
+    end
+
+    context 'when on self managed' do
+      it 'does not change partition_id or source_partition_id' do
+        expect { migrate! }.not_to raise_error
+
+        expect(sources_pipelines.where(partition_id: 100).count).to eq(2)
+        expect(sources_pipelines.where(partition_id: 100).count).to eq(2)
+        expect(sources_pipelines.where(source_partition_id: 101).count).to eq(2)
+        expect(sources_pipelines.where(source_partition_id: 101).count).to eq(2)
+      end
+    end
+  end
+end