The timestamp is the time for which the data was recorded for. This might differ from imported_at which contains the timestamp on when this entry was created. Additionally I have a few extra columns like yearmonth (e.g. 202010), which makes it easier and faster for some queries and graphs.
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，详情可参考wps
Раскрыто число погибших при ударе ракетами Storm Shadow по российскому городу21:00
• 点评：上述研究把科幻片《火星救援》里的“土豆农场”搬到了月球实验室，首次证明“地球土壤生态”能在外星模拟环境中再生，为未来的月球农业提供了新思路。（罗仙仙）