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Trade receivables - Summary of ECL Allowance for Trade Receivables (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Trade receivables    
Opening loss allowance ¥ (985,725)  
Closing loss allowance (388,504) ¥ (985,725)
Trade receivables | Loss allowances    
Trade receivables    
Opening loss allowance 60,513  
Closing loss allowance 63,865 60,513
Trade receivables | Loss allowances | Aggregate continuing and discontinued operations [member]    
Trade receivables    
Opening loss allowance 60,513 22,252
Arising from business combination   105
Provision for loss allowance, net 10,341 38,156
Disposal of subsidiaries (1,717)  
Closing loss allowance 69,137 ¥ 60,513
Trade receivables | Loss allowances | Included in assets classified as held for sale    
Trade receivables    
Closing loss allowance ¥ 5,272