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Refactor storage layer to support multiple databases #6231
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This is in preparation for having multiple data stores that offer different functionality, e.g. splitting out state or event storage.
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richvdh
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synapse/storage/data_stores/main/schema/delta/25/00background_updates.sql
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This is an initial refactor that starts the split out of
DataStoreinto the concept of "data stores". Broadly, this moves all the stores insynapse.storageintosynapse.storage.data_stores.mainand fixes upprepare_databaseto correctly apply schemas from multiple data stores.The commits should be independently reviewable. The first one is the big one, and is the moving of files. The only changes are that helper classes/exceptions/etc that are imported from outside
synapse.storageget left insynapse.storagerather than getting moved into a data store (the aim being that things outside storage rarely if ever need to know about the concept of data stores).Currently this still exports the same
DataStoreinsynapse.storage, but splitting that out some more is a job for a separate PR