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No custom scalars, only Blob, Boolean, Date, Float, ID, Int, JSON, and String are available
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No custom input objects, only custom input scalars allowed in custom resolvers
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Each schema is limited to a single canister with ~4 GB of storage
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Very inneficient querying
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No automatic migrations, once you deploy the schema is final unless you implement your own migrations
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No authorization at the schema level, deal with it through your own custom authorization at the canister function level
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No automated tests
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No subscriptions
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No transactions