--- Debugging Installments for Project 3, Flat 48 ---
Total rows in inst_table: 10776
Rows matching project=3 AND flat_type=48: 409
Rows matching project=3: 4381
Rows matching flat_type=48: 409

--- Sample Data (First 5 rows) ---
ID: 16 | Proj: '2' | Flat: '1' | Amount: 1030000
ID: 17 | Proj: '2' | Flat: '1' | Amount: 27500
ID: 18 | Proj: '2' | Flat: '1' | Amount: 27500
ID: 35 | Proj: '2' | Flat: '2' | Amount: 775000
ID: 36 | Proj: '2' | Flat: '2' | Amount: 25000