bug: import from mysql causes BIGINT UNSIGNED

[hborham]

Describe the bug
While following the Integration > MySQL, I keep getting this error on a sample schema for one of our repos.

To Reproduce
Steps to reproduce the behavior:
It's not clear to me which table and column has this issue due to the output. So intentionally omitted.

1. Schema (if applicable)

2. See error

Error: error occurred while decoding column 4: mismatched types; Rust type `core::option::Option<u64>` (as SQL type `BIGINT UNSIGNED`) is not compatible with SQL type `BIGINT`

Caused by:
    mismatched types; Rust type `core::option::Option<u64>` (as SQL type `BIGINT UNSIGNED`) is not compatible with SQL type `BIGINT`

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Environment (please complete the following information):

• OS: MacOS
• Version: synth 0.6.9

Additional context
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