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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Probably not, unless you want to constantly replace batteries, or have the time/desire to fine tune sleep/deep sleep states. Take a look at the PicoClick project to see some of the work required to get power consumption down to an acceptable level.
The easy option is to just get a Zwave or Zigbee remote. With a hub running Zigbee2MQTT or Zwave2MQTT, you can translate the button presses to MQTT and trigger your Tasmota devices. Alternatively, you could set up a Milight hub (which also translates button presses to MQTT topics) and use any of the commercially available Milight remotes as inputs.