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Bytea

As explained in Build Financial Software with Generative AI (From Scratch)

BYTEA is a PostgreSQL binary-string data type for storing variable-length binary data.

BYTEA is a PostgreSQL data type for storing variable-length binary data. In a company database, it can hold a logo so the application can load the image with the company record. section 10.2.1

Keeping the logo in the database avoids introducing external services such as AWS S3 or a CDN. External storage may improve UI performance, so the choice should reflect production and infrastructure needs. section 10.2.1

Company logo column

A company table can declare `logo BYTEA DEFAULT NULL`, allowing companies without an uploaded logo while storing binary image data for those that have one.

How Build Financial Software with Generative AI (From Scratch) covers it

How deep it goes
Defines BYTEA and demonstrates its column declaration, while deferring detailed image-performance implementation.
Examples
Uses a nullable company logo column as the concrete BYTEA example.
What you can do after
Build it from scratch by adding a nullable BYTEA logo field to a PostgreSQL company table.
How it connects
Connects binary data storage with PostgreSQL schemas, company records, UI performance, AWS S3, and CDNs.
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This explainer was generated by Manning's knowledge graph from the text of Build Financial Software with Generative AI (From Scratch). The section links point to the parts of the book it draws on.