3.1.4 (released on π-day!)

• Added BigAutoField to support 64-bit auto-incrementing primary keys.
• Use Peewee-compatible datetime serialization when exporting JSON from a DataSet. Previously the JSON export used ISO-8601 by default. See #1536.
• Added Database.batch_commit helper to wrap iterators in chunked transactions. See #1539 for discussion.

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