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Body Context: `rbenv exec rails db:create` failed with `ActiveRecord::ConnectionNotEstablished`. The PostgreSQL server was not running or accessible. Resolution: I started the PostgreSQL service (e.g., `brew services start postgresql`). Learning: I learned to ensure required background services like databases are running before Rails attempts to connect to them (e.g., `rails db:create`, `rails server`). Checking service status (`brew services list`) is important.

Learned on (YYYY-MM-DD)

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