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+Storage Layer
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+=============
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+
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+The storage layer is split up into multiple parts to allow Synapse to run
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+against different configurations of databases (e.g. single or multiple
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+databases). The `data_stores` are classes that talk directly to a single
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+database and have associated schemas, background updates, etc. On top of those
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+there are (or will be) classes that provide high level interfaces that combine
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+calls to multiple `data_stores`.
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+
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+There are also schemas that get applied to every database, regardless of the
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+data stores associated with them (e.g. the schema version tables), which are
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+stored in `synapse.storage.schema`.
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