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Credit risk (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Credit risk    
Trade receivable ¥ 12,568 ¥ 0
Loan receivables   248,350
Accrued interest   157,726
Gross loan receivables   406,076
Credit impairment losses   (212,394)
Carrying Amount 12,568 193,682
Stage 1 [Member]    
Credit risk    
Trade receivable 12,568  
Loan receivables 0 0
Accrued interest 0 0
Gross loan receivables 0 0
Credit impairment losses 0 0
Carrying Amount 12,568  
Stage 2 [Member]    
Credit risk    
Loan receivables 0 0
Accrued interest 0 0
Gross loan receivables 0 0
Credit impairment losses 0 0
Stage 3 [Member]    
Credit risk    
Loan receivables 0 248,350
Accrued interest 0 157,726
Gross loan receivables 0 406,076
Credit impairment losses ¥ 0 (212,394)
Carrying Amount   ¥ 193,682