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This PR fixes a bug where projections could skip events if they were written within the same microsecond, which can occur during high load on different transactions. ## Problem The event query ordering was not fully deterministic. Events created at the exact same time (same `position`) and in the same transaction (`in_tx_order`) were not guaranteed to be returned in the same order on subsequent queries. This could lead to some events being skipped by the projection logic. ## Solution To solve this, the `ORDER BY` clause for event queries has been extended to include `instance_id`, `aggregate_type`, and `aggregate_id`. This ensures a stable and deterministic ordering for all events, even if they share the same timestamp. ## Additionally changes: * Replaced a manual slice search with the more idiomatic `slices.Contains` to skip already projected instances. * Changed the handling of already locked projections to log a debug message and skip execution instead of returning an error. * Ensures the database transaction is explicitly committed.