perf: composite index on (serial_no, warehouse, posting_datetime)

erpnext/patches.txt

@@ -488,3 +488,4 @@ erpnext.patches.v16_0.rename_secondary_item_type_field
 erpnext.patches.v16_0.submit_existing_product_bundles #1
 erpnext.patches.v16_0.migrate_subscription_generate_invoice_at
 erpnext.patches.v16_0.rename_subscription_billing_period_fields
+erpnext.patches.v16_0.drop_redundant_serial_no_index_from_sabb

erpnext/patches/v16_0/drop_redundant_serial_no_index_from_sabb.py

@@ -0,0 +1,7 @@
+from frappe.database.utils import drop_index_if_exists
+
+
+def execute():
+	drop_index_if_exists("tabSerial and Batch Entry", "serial_no")
+	drop_index_if_exists("tabSerial and Batch Entry", "warehouse")
+	drop_index_if_exists("tabSerial and Batch Entry", "type_of_transaction")

erpnext/stock/doctype/serial_and_batch_entry/serial_and_batch_entry.json

@@ -37,8 +37,7 @@
    "in_list_view": 1,
    "in_standard_filter": 1,
    "label": "Serial No",
-   "options": "Serial No",
-   "search_index": 1
+   "options": "Serial No"
   },
   {
    "depends_on": "eval:parent.has_batch_no == 1",
@@ -62,8 +61,7 @@
    "fieldtype": "Link",
    "in_list_view": 1,
    "label": "Warehouse",
-   "options": "Warehouse",
-   "search_index": 1
+   "options": "Warehouse"
   },
   {
    "fieldname": "column_break_2",
@@ -178,8 +176,7 @@
    "fieldtype": "Data",
    "label": "Type of Transaction",
    "no_copy": 1,
-   "read_only": 1,
-   "search_index": 1
+   "read_only": 1
   },
   {
    "fieldname": "column_break_eykr",

erpnext/stock/doctype/serial_and_batch_entry/serial_and_batch_entry.py

@@ -42,3 +42,4 @@ class SerialandBatchEntry(Document):
 
 def on_doctype_update():
 	frappe.db.add_index("Serial and Batch Entry", ["warehouse", "batch_no", "posting_datetime"])
+	frappe.db.add_index("Serial and Batch Entry", ["warehouse", "serial_no", "posting_datetime"])