From ac0ef07a77d10b9ee30e81aac27e826184cbdd72 Mon Sep 17 00:00:00 2001
From: jackstar12 <62219658+jackstar12@users.noreply.github.com>
Date: Thu, 24 Aug 2023 12:20:15 +0200
Subject: [PATCH] optimize balances view (#1779)

* optimize balances view

flake8

flake8

* fix line length
---
 lnbits/core/migrations.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lnbits/core/migrations.py b/lnbits/core/migrations.py
index 6c3743cb..fce8e480 100644
--- a/lnbits/core/migrations.py
+++ b/lnbits/core/migrations.py
@@ -302,3 +302,20 @@ async def m010_create_installed_extensions_table(db):
         );
     """
     )
+
+
+async def m011_optimize_balances_view(db):
+    """
+    Make the calculation of the balance a single aggregation
+    over the payments table instead of 2.
+    """
+    await db.execute("DROP VIEW balances")
+    await db.execute(
+        """
+        CREATE VIEW balances AS
+        SELECT wallet, SUM(amount - abs(fee)) AS balance
+        FROM apipayments
+        WHERE (pending = false AND amount > 0) OR amount < 0
+        GROUP BY wallet
+    """
+    )