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Not a database person but 1000 tables does seem like an extraordinary amount imo. At that scale I wonder if such a use case warrants a document based database...

I have been working in the banking industry since 2015 as an Oracle database developer and contractor and having a few hundred or several thousand tables in a single database schema is typical. In a single ETL or ELT process you can have several different tables such as staging tables, configuration tables, tables for slowly changing dimensions, enrichment tables, configuration tables, temporary tables, tables for exchange partition, etc.

On a somewhat related note: the OpenType (OT) font format specifies 55 different "tables". These are not really what would be a table in a database but more like sections that may have multiple tables. E.g. the "math" OT table has constants, glyph info, italic corrections, top accent attachment, kern info, variants, glyph construction... -- I can't say for sure but I think a hundred tables to properly describe a font is probably a good estimate.

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