Store BigInt as SQLite integer?

[snoggles]

Problem

I have a large number of discord snowflakes (i.e. BigInt) to store in SQLite via Sequelize. I'd like to store them as 8-byte integers rather than 18-byte strings, but I'm running up against #17154.

Attempted Solution

Defining the following mapping results in precision loss. The conversion to JS number (non-BigInt) happens before my mapping is invoked.

{
    type: DataTypes.BIGINT,
    get() {
        const val = this.getDataValue(colName); // number, not bigint :(
        return val ? val.toString() : null;
    },
    set(val) {
        const bigint = BigInt(val)
        this.setDataValue(colName, bigint);
    }
}

SQLite Dialect Mappings?

The following line from https://sequelize.org/docs/v6/other-topics/extending-data-types/ seems relevant:

After creating this new datatype, you need to map this datatype in each database dialect and make some adjustments.

However, it only shows postgres mappings--no SQLite. Both Claude Code and I are at a loss to figure out correct SQLite mappings.

Rejected Alternatives

I don't want to run a separate database service for this.
I don't want to store the values as opaque BLOBs that I cannot inspect in the DB.

Context

https://github.com/snoggles/loggles/blob/main/src/db/snowflake.js (currently using strings, sadly)

Guidance Request

Are there existing examples of storing BigInts as SQLite numbers--or at least using sequelize to create SQLite dialect mappings? Are SQLite dialect mappings the correct solution?