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MobilityDB is implemented as an extension to PostgreSQL and PostGIS. It implements persistent database types, and query operations for managing geospatial trajectories and their time-varying properties. A geospatial trajectory is generally collected as a sequence of discrete location points and time-stamps, However, the movement is continuous. While this interpolation restores the movement continuity, it does not correspond to an increased storage size. On the contrary, it allows to discover redundant observations and to remove them. as illustrated in the bottom most figure. So, only the observations where a significant change in speed/direction occur are retained. This process is called normalization, and it typically results in significant reduction in storage size compared to input points.

PostgreSQL is a powerful, open source object-relational database system that uses and extends the SQL language combined with many features that safely store and scale the most complicated data workloads. ​ ​PostgreSQL has earned a strong reputation for its proven architecture, reliability, data integrity, robust feature set, extensibility, and the dedication of the open source community ​ Multi-tenant SaaS Solution where SaaS apps often have a natural dimension on which to distribute data across nodes—dimensions such as tenant, customer, or account_id. Which means SaaS apps have a data model that is a good fit for a distributed database like Citus: just shard by tenant_id. Features include: Transparent sharding in the database layer SQL query & transaction routing Easy to add nodes and rebalance shards Ability to scale out without giving up Postgres