diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb4b623c0..2f04ebca6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -212,6 +212,25 @@ The format follows [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
   failure paths. Comprehensive BDD test coverage validates the fix under concurrent
   execution and confirms proper cleanup behavior.
 
+- **Database resource types (PostgreSQL, SQLite) with transaction-based sandbox strategy** (#8608):
+  Implemented comprehensive database resource support enabling users to interact with
+  PostgreSQL and SQLite backends through a unified resource interface. Introduces
+  `DatabaseResourceHandler` providing full CRUD operations (`read`, `write`, `delete`,
+  `list_children`), connection validation with automatic credential masking via
+  :mod:`cleveragents.shared.redaction`, and transaction-based sandbox strategy using
+  BEGIN/COMMIT/ROLLBACK wrappers for safe, isolated database operations. SQLite-specific
+  checkpoint and rollback support with SAVEPOINT semantics. Support for multiple backends (PostgreSQL, SQLite, MySQL, DuckDB) via unified "DatabaseResourceHandler" and type-specific routing. BDD test
+  coverage in ``features/database_resources.feature`` (connection validation, CRUD workflows,
+  transaction/rollback behavior, error handling, credential masking verification) and
+  Robot Framework integration tests in ``robot/database_resources.robot``.
+
+- **TransactionSandbox infrastructure for database resource isolation** (#8608):
+  Implemented ``TransactionSandbox`` class with BEGIN/COMMIT/ROLLBACK lifecycle
+  management for transaction-based sandbox strategy. Wired into ``SandboxFactory``
+  as the strategy resolver for database resource types. Added ``database`` resource type
+  registration in bootstrap builtin types and updated ``_resource_registry_data.py``
+  to recognize database resource categories.
+
 ### Fixed
 
 - **fix(repositories): derive PlanResult.success from result_success column instead of error_message** (#7501):
diff --git a/CONTRIBUTORS.md b/CONTRIBUTORS.md
index 358d21b58..e459300bd 100644
--- a/CONTRIBUTORS.md
+++ b/CONTRIBUTORS.md
@@ -36,3 +36,4 @@ Below are some of the specific details of various contributions.
 * HAL 9000 has contributed the error-suppression removal fix (PR #9247 / issue #9060): removed both `try...except Exception:` blocks in `register_registry_agents()` that silently suppressed errors from `actor_registry.list_actors()` and the route bridge refresh, enabling exceptions to propagate per CONTRIBUTING.md fail-fast policy. Added three Behave scenarios verifying RuntimeError, AttributeError, and TypeError propagation.
 * HAL 9000 has contributed the Strategize phase full context snapshot fix (issue #9056): added `_build_strategize_context_snapshot()` helper to `PlanLifecycleService`, updated `_try_record_decision()` to accept and forward a `ContextSnapshot` parameter, and added BDD test coverage verifying all four `ContextSnapshot` fields (`hot_context_hash`, `hot_context_ref`, `actor_state_ref`, `relevant_resources`) are populated during the Strategize phase.
 * HAL 9000 has contributed the ACMS context path matching fix (PR #10975 / issue #10972): corrects `_path_matches()` and `_matches_pattern()` to properly match absolute fragment paths against relative glob patterns by auto-prefixing with `**/` before calling `PurePath.full_match()`, preventing silent inefficacy of include/exclude filters for absolute paths in fragment metadata.
+* HAL 9000 has contributed database resource types (PostgreSQL, SQLite) with transaction-based sandbox strategy: implemented ``DatabaseResourceHandler`` providing full CRUD operations (`read`, `write`, `delete`, `list_children`) and connection validation with automatic credential masking for PostgreSQL and SQLite backends. Includes ``TransactionSandbox`` infrastructure wired into ``SandboxFactory``, BDD test coverage in ``features/database_resources.feature``, and Robot Framework integration tests in ``robot/database_resources.robot`` (PR #10591 / issue #8608, Epic #8568).