Improve error messages if no matching gauge version found Avoid hitting the NOT NULL constraint of the referencing validity column in order to hit the foreign key constraint instead and emit an appropriate error message in all such cases.

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

# backend binary
cmd/gemma/gemma

# Dependency directories
**/node_modules

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

# Tags tables
**/TAGS