Behaviour for defining a repository (database connection).

Implement otp_app/0 to tell Kura which application owns the repo's migrations.

-module(my_repo).
-behaviour(kura_repo).
-export([otp_app/0]).

otp_app() -> my_app.

Configure the database connection under the kura application env. Kura starts the pgo pool automatically during application startup:

[{kura, [
    {repo, my_repo},
    {host, "localhost"},
    {port, 5432},
    {database, "my_db"},
    {user, "postgres"},
    {password, "secret"},
    {pool_size, 10}
]}].

For backward compatibility, Kura also supports per-app config via application:get_env(OtpApp, RepoModule). The kura app env is checked first.

Optionally implement init/1 to modify config at runtime — useful for reading secrets from files, environment variables, or external services:

-module(my_repo).
-behaviour(kura_repo).
-export([otp_app/0, init/1]).

otp_app() -> my_app.

init(Config) ->
    Config#{
        password => list_to_binary(os:getenv("DB_PASSWORD", "postgres"))
    }.