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Trade receivables - Additional informations (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Trade receivables |  |
Total trade receivables | ¥ 506,535 | ¥ 710,669
Cost |  |
Trade receivables |  |
Total trade receivables | 582,068 | 779,458
Cost | Up to 1 year |  |
Trade receivables |  |
Total trade receivables | 510,135 | 694,157
Cost | 1 to 2 years |  |
Trade receivables |  |
Total trade receivables | 35,830 | 55,187
Cost | 2 to 3 years |  |
Trade receivables |  |
Total trade receivables | 20,069 | 21,103
Cost | Above 3 years |  |
Trade receivables |  |
Total trade receivables | ¥ 16,034 | ¥ 9,011

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