Prefix on FastAPI url to switch databases?

FastAPI Routing Question:

Hi, I've got 3 databases set up (master databases that is, postgres instances) as such:

 master1: - db1: - tables... - db2: - and so on... - db3: master2: - db1: - db2: - db3: master3: - db1: - db2: - db3: 

all managed with Alembic so they'll all be the same, but I'll add error handling. But, all the databases in each instance actually have the same name, its not like master1_db1 = 'abc' and master2_db1 = 'def', they're both actually db1 for all intents and purposes.

I want to expose endpoints as follows: /{master_i}/{db_j}/{tables_xyz}

so they can visit /master1/db1/table1 but also switch to /master2/db1/table1 to get data from a different environment. (These are really just local, dev, and prod databases fwiw).

But the logic shouldn't change between the .../db1/table1 part, in fact, I want to strip the prefix {master_i} and only have the actual logic for /db1_table and then the variable {master_i} is a selector for what sql-alchemy engine I want to use.

So, my api is up and running at /db1/table1/ but I want the user to be at {master_i}/db1/table1 and strip off the master_i to send to sql-alchemy db-engine, and all logic to be the same at /db1/table1/.

So, when they visit {master_i}/db1/table1:

SQLAlchemy Engine get the {master_i} part

 def sql_engine(passed_db_name, server_port): db_url = URL.create( "postgresql+psycopg2", username = os.getenv('DB_USER'), password = os.getenv('DB_PASS'), host = '127.0.0.1', port = int(server_port), database = str(**master_i**) # <<< Where I am using the path prefix {master_i} ) return create_engine(db_url) 

and FastAPI gets the /db1/table1

 @db1_router.get('/table_1') def get_table_1(): return [{"get": "sql_alchemy_output_from_{master_i}_here"}] 

I just don't want 3 copies of the same FastAPI routers/endpoints/functions when they're not going to differ.