Azure Tables - Entity
An entity in a table can have up to 255 properties, of which three are system properties:
PartitionKey - Entities with the same partition key can be queried more quickly, and inserted/updated in atomic operations.
RowKey - An entity's row key is its unique identifier within a partition.
Timestamp - The server manages the value of Timestamp, which cannot be modified.
The total size of all data in an entity's properties cannot be more than 1 MB.
The PartitionKey and RowKey must uniquely identify every entity in a table.
