perf: Only created company indexes in multi-company setups

A vast vast majority of installations don't have multiple companies, so
this unnecessary index is an overhead for them.

erpnext/accounts/doctype/gl_entry/gl_entry.json

@@ -242,8 +242,7 @@
    "label": "Company",
    "oldfieldname": "company",
    "oldfieldtype": "Link",
-   "options": "Company",
-   "search_index": 1
+   "options": "Company"
   },
   {
    "fieldname": "finance_book",
@@ -358,7 +357,7 @@
  "idx": 1,
  "in_create": 1,
  "links": [],
- "modified": "2025-04-21 22:03:45.548936",
+ "modified": "2025-04-21 22:10:25.844576",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "GL Entry",

erpnext/accounts/doctype/gl_entry/gl_entry.py

@@ -439,8 +439,15 @@ def update_against_account(voucher_type, voucher_no):
 
 def on_doctype_update():
 	frappe.db.add_index("GL Entry", ["voucher_type", "voucher_no"])
-	frappe.db.add_index("GL Entry", ["posting_date", "company"])
 	frappe.db.add_index("GL Entry", ["party_type", "party"])
+	add_company_indexes()
+
+
+def add_company_indexes():
+	"""Only add company indexes if more than one company exists."""
+	if frappe.db.count("Company", {"name": ("not like", "%(Demo)%")}) > 1:
+		frappe.db.add_index("GL Entry", ["posting_date", "company"])
+		frappe.db.add_index("GL Entry", ["company"])
 
 
 def rename_gle_sle_docs():

erpnext/setup/doctype/company/company.py

@@ -707,6 +707,11 @@ class Company(NestedSet):
 		):
 			frappe.flags.parent_company_changed = True
 
+	def before_insert(self):
+		from erpnext.accounts.doctype.gl_entry.gl_entry import add_company_indexes
+
+		add_company_indexes()
+
 
 def get_name_with_abbr(name, company):
 	company_abbr = frappe.get_cached_value("Company", company, "abbr")