Remove pds search results index

This index restricts the PDS searches to only be able to run once per
import/patient combo. We don't particularly need this protection, and as
it turns out when we merge two patients this breaks because we try to
merge their search results too.

Author: misaka

app/models/pds_search_result.rb

@@ -16,9 +16,8 @@
 #
 # Indexes
 #
-#  index_pds_search_results_on_import               (import_type,import_id)
-#  index_pds_search_results_on_patient_id           (patient_id)
-#  index_pds_search_results_on_patient_import_step  (patient_id,import_type,import_id,step) UNIQUE
+#  index_pds_search_results_on_import      (import_type,import_id)
+#  index_pds_search_results_on_patient_id  (patient_id)
 #
 # Foreign Keys
 #

db/migrate/20250826135132_remove_index_pds_search_results_on_patient_import_step.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class RemoveIndexPDSSearchResultsOnPatientImportStep < ActiveRecord::Migration[
+  8.0
+]
+  def change
+    remove_index :pds_search_results,
+                 name: "index_pds_search_results_on_patient_import_step",
+                 column: %i[patient_id import_type import_id step],
+                 unique: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.0].define(version: 2025_08_22_094829) do
+ActiveRecord::Schema[8.0].define(version: 2025_08_26_135132) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_catalog.plpgsql"
   enable_extension "pg_trgm"
@@ -718,7 +718,6 @@
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["import_type", "import_id"], name: "index_pds_search_results_on_import"
-    t.index ["patient_id", "import_type", "import_id", "step"], name: "index_pds_search_results_on_patient_import_step", unique: true
     t.index ["patient_id"], name: "index_pds_search_results_on_patient_id"
   end
 

spec/factories/pds_search_results.rb

@@ -16,9 +16,8 @@
 #
 # Indexes
 #
-#  index_pds_search_results_on_import               (import_type,import_id)
-#  index_pds_search_results_on_patient_id           (patient_id)
-#  index_pds_search_results_on_patient_import_step  (patient_id,import_type,import_id,step) UNIQUE
+#  index_pds_search_results_on_import      (import_type,import_id)
+#  index_pds_search_results_on_patient_id  (patient_id)
 #
 # Foreign Keys
 #