sqldb: fix end date filter when querying invoices

Previously, the SQL implementation of the invoice query simply
converted the start and end timestamps to time and used them
in SQL queries to check for inclusivity. However, this logic
failed when the start and end timestamps were equal.

This commit addresses and corrects this issue.

invoices/sql_store.go

@@ -925,8 +925,10 @@ func (i *SQLStore) QueryInvoices(ctx context.Context,
 			}
 
 			if q.CreationDateEnd != 0 {
+				// We need to add 1 to the end date as we're
+				// checking less than the end date in SQL.
 				params.CreatedBefore = sqldb.SQLTime(
-					time.Unix(q.CreationDateEnd, 0).UTC(),
+					time.Unix(q.CreationDateEnd+1, 0).UTC(),
 				)
 			}
 

sqldb/sqlc/queries/invoices.sql

@@ -76,7 +76,7 @@ WHERE (
     created_at >= sqlc.narg('created_after') OR
     sqlc.narg('created_after') IS NULL
 ) AND (
-    created_at <= sqlc.narg('created_before') OR 
+    created_at < sqlc.narg('created_before') OR 
     sqlc.narg('created_before') IS NULL
 ) AND (
     CASE