fix: dropping index to improve performance (#42820)

fix: droping index to improve peformance

erpnext/patches.txt

@@ -375,3 +375,4 @@ erpnext.patches.v15_0.update_warehouse_field_in_asset_repair_consumed_item_docty
 erpnext.patches.v15_0.update_asset_repair_field_in_stock_entry
 erpnext.patches.v15_0.update_total_number_of_booked_depreciations
 erpnext.patches.v15_0.do_not_use_batchwise_valuation
+erpnext.patches.v15_0.drop_index_posting_datetime_from_sle

erpnext/patches/v15_0/drop_index_posting_datetime_from_sle.py

@@ -0,0 +1,16 @@
+import click
+import frappe
+
+
+def execute():
+	table = "tabStock Ledger Entry"
+	index = "posting_datetime_creation_index"
+
+	if not frappe.db.has_index(table, index):
+		return
+
+	try:
+		frappe.db.sql_ddl(f"ALTER TABLE `{table}` DROP INDEX `{index}`")
+		click.echo(f"✓ dropped {index} index from {table}")
+	except Exception:
+		frappe.log_error("Failed to drop index")

erpnext/stock/doctype/stock_ledger_entry/stock_ledger_entry.py

@@ -351,4 +351,3 @@ def on_doctype_update():
 	frappe.db.add_index("Stock Ledger Entry", ["voucher_no", "voucher_type"])
 	frappe.db.add_index("Stock Ledger Entry", ["batch_no", "item_code", "warehouse"])
 	frappe.db.add_index("Stock Ledger Entry", ["warehouse", "item_code"], "item_warehouse")
-	frappe.db.add_index("Stock Ledger Entry", ["posting_datetime", "creation"])