feat: add native PostgreSQL backend#627
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Add a native PostgreSQL backend (`postgres`) powered by pgx/v5. - Real-time change notification via LISTEN/NOTIFY, eliminating polling in watch mode (channel `confd_update`). - Prefix scans via SQL LIKE so confd keys map onto a config table, and SQL Views can expose existing business tables as confd keys. - Standard username/password authentication. New `confd postgres` subcommand (--node, --username, --password, --database, --table) plus `database` field in confd.toml. Registered in pkg/backends/client.go and pkg/backends/config.go. Includes unit tests (pkg/backends/postgres/client_test.go), an integration test harness (test/integration/backends/postgres), and a walkthrough in POSTGRES_DEMO.md. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Splits the PostgreSQL half out of #621 as requested, so it can be assessed independently.
Add a native PostgreSQL backend (
postgres) powered by pgx/v5.confd_update).New
confd postgressubcommand (--node, --username, --password, --database, --table) plusdatabasefield in confd.toml. Registered in pkg/backends/client.go and pkg/backends/config.go.Includes unit tests (pkg/backends/postgres/client_test.go), an integration test harness (test/integration/backends/postgres), and a walkthrough in POSTGRES_DEMO.md.