fix: translate multi-host URLs via SQLAlchemy dialect for LISTEN#12
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asyncpg.connect(dsn) failed with TargetServerAttributeNotMatched on URLs of the form ?host=h1:5432&host=h2:5432 because render_as_string URL-encodes the host:port pair into a single token asyncpg can't parse. Delegate URL → kwargs translation to engine.dialect.create_connect_args so multi-host URLs reach asyncpg as host=[...], port=[...] (same approach as the org's db-retry). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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asyncpg.connect(dsn) failed with TargetServerAttributeNotMatched on URLs of the form ?host=h1:5432&host=h2:5432 because render_as_string URL-encodes the host:port pair into a single token asyncpg can't parse. Delegate URL → kwargs translation to engine.dialect.create_connect_args so multi-host URLs reach asyncpg as host=[...], port=[...] (same approach as the org's db-retry).