erp5_{mysql,security_uid}_innodb_catalog: Reduce disk usage.
Replace several varchar columns to save 2 bytes (when upgrading from utf8 encoding) or 3 bytes (when upgrading from utf8mb4) per character. Mark columns as "not null" to save one bit per column (so about one byte per 8 columns "not null"-ified, depending on how many null-able columns remain).
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