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Related party transactions - Key management personnel compensations (Details) - Key management - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of transactions between related parties      
Wages and salaries ¥ 21,123 ¥ 28,163 ¥ 29,115
Welfare and other benefits 614 772 1,385
Share-based payments 8,401 4,187 3,627
Total ¥ 31,138 ¥ 33,122 ¥ 34,127