Fix syntax error in schema script serial is a data type, just like int, and only one can be given. In passing use the standard conforming way to specify the auto-generated column and make it the real primary key.

# documentation
**/README*
**/docs
**/*.md

# backend binary
cmd/gemma/gemma

# Dependency directories
**/node_modules

# local dotenv environment variables file
client/.env.local

# Tags tables
**/TAGS