Fix: for Issue with Model Generation in PostgreSQL with Multiple Schemas

[endoumame]

Phenomenon

• When using PostgreSQL, if there are schemas other than the public schema, the Model is not generated correctly.

Cause

• When executing the SQL to retrieve table metadata for generating the Model, the data is duplicated for each schema.

Solution

• Modify the SQL statement to only retrieve metadata from the public schema, even when multiple schemas exist.

[Benjaminhu]

@endou-mame please take a look at my PR: #320