Modern column-oriented relational data warehouses will handle time-series data fine in 95% of cases. What "time-series" databases offer is more functionality a

Modern column-oriented relational data warehouses will handle time-series data fine in 95% of cases. What "time-series" databases offer is more functionality around time being a primary component of the data. For example, automatic partitoning/sharding on time, various date handling techniques, better bucketing/gap filling/smoothing functions, data retention policies based on time, automatic rollups and aggregations, etc. Some have custom data stores, some use key/value stores like Hbase or Cassandra, and others use relational databases. Using relational foundations offers more flexibility (like Timescale on top of Postgres) than the others like InfluxDB or OpenTSDB.