diff --git a/pom.xml b/pom.xml
index a938fdef..89c8c303 100644
--- a/pom.xml
+++ b/pom.xml
@@ -343,6 +343,10 @@
           <XaddSerialVersionUID>true</XaddSerialVersionUID>
           <showWeaveInfo>false</showWeaveInfo>
           <forceAjcCompile>true</forceAjcCompile>
+          <includes>
+            <include>**/impl/*.java</include>
+            <include>**/*.aj</include>
+          </includes>
           <aspectLibraries>
             <aspectLibrary>
               <groupId>org.folio</groupId>
diff --git a/src/main/java/org/folio/dao/DbUtils.java b/src/main/java/org/folio/dao/DbUtils.java
new file mode 100644
index 00000000..b964be1a
--- /dev/null
+++ b/src/main/java/org/folio/dao/DbUtils.java
@@ -0,0 +1,13 @@
+package org.folio.dao;
+
+import static org.folio.rest.persist.PostgresClient.convertToPsqlStandard;
+
+public class DbUtils {
+
+  private static final String TABLE_NAME_TEMPLATE = "%s.%s";
+
+  public static String getTenantTableName(String tenantId, String tableName) {
+    return TABLE_NAME_TEMPLATE.formatted(convertToPsqlStandard(tenantId), tableName);
+  }
+
+}
diff --git a/src/main/java/org/folio/dao/audit/AuditOutboxEventLogDAO.java b/src/main/java/org/folio/dao/audit/AuditOutboxEventLogDAO.java
new file mode 100644
index 00000000..a145b4ba
--- /dev/null
+++ b/src/main/java/org/folio/dao/audit/AuditOutboxEventLogDAO.java
@@ -0,0 +1,18 @@
+package org.folio.dao.audit;
+
+import java.util.List;
+
+import org.folio.rest.jaxrs.model.OutboxEventLog;
+import org.folio.rest.persist.Conn;
+
+import io.vertx.core.Future;
+
+public interface AuditOutboxEventLogDAO {
+
+  Future<List<OutboxEventLog>> getEventLogs(Conn conn, String tenantId);
+
+  Future<String> saveEventLog(Conn conn, OutboxEventLog eventLog, String tenantId);
+
+  Future<Integer> deleteEventLogs(Conn conn, List<String> eventIds, String tenantId);
+
+}
diff --git a/src/main/java/org/folio/dao/audit/AuditOutboxEventLogPostgresDAO.java b/src/main/java/org/folio/dao/audit/AuditOutboxEventLogPostgresDAO.java
new file mode 100644
index 00000000..ac85ed9b
--- /dev/null
+++ b/src/main/java/org/folio/dao/audit/AuditOutboxEventLogPostgresDAO.java
@@ -0,0 +1,72 @@
+package org.folio.dao.audit;
+
+import static org.folio.dao.DbUtils.getTenantTableName;
+
+import java.util.List;
+import java.util.UUID;
+
+import org.folio.rest.jaxrs.model.OutboxEventLog;
+import org.folio.rest.persist.Conn;
+import org.folio.rest.persist.Criteria.Criterion;
+import org.folio.rest.persist.Criteria.Limit;
+import org.folio.rest.persist.interfaces.Results;
+
+import io.vertx.core.Future;
+import io.vertx.sqlclient.SqlResult;
+import io.vertx.sqlclient.Tuple;
+import lombok.extern.log4j.Log4j2;
+
+@Log4j2
+public class AuditOutboxEventLogPostgresDAO implements AuditOutboxEventLogDAO {
+
+  public static final String OUTBOX_TABLE_NAME = "outbox_event_log";
+  private static final String BATCH_DELETE = "DELETE from %s where event_id = ANY ($1)";
+
+  /**
+   * Get all event logs from outbox table.
+   *
+   * @param conn     the sql connection from transaction
+   * @param tenantId the tenant id
+   * @return future of a list of fetched event logs
+   */
+  public Future<List<OutboxEventLog>> getEventLogs(Conn conn, String tenantId) {
+    log.trace("getEventLogs:: Fetching event logs from outbox table for tenantId: '{}'", tenantId);
+    var tableName = getTenantTableName(tenantId, OUTBOX_TABLE_NAME);
+    return conn.get(tableName, OutboxEventLog.class, new Criterion().setLimit(new Limit(1000)))
+      .map(Results::getResults)
+      .onFailure(t -> log.warn("getEventLogs:: Failed to fetch event logs for tenantId: '{}'", tenantId, t));
+  }
+
+  /**
+   * Saves event log to outbox table.
+   *
+   * @param conn     the sql connection from transaction
+   * @param eventLog the event log to save
+   * @param tenantId the tenant id
+   * @return future of id of the inserted entity
+   */
+  public Future<String> saveEventLog(Conn conn, OutboxEventLog eventLog, String tenantId) {
+    log.debug("saveEventLog:: Saving event log to outbox table with eventId: '{}'", eventLog.getEventId());
+    var tableName = getTenantTableName(tenantId, OUTBOX_TABLE_NAME);
+    return conn.save(tableName, eventLog)
+      .onFailure(t -> log.warn("saveEventLog:: Failed to save event log with id: '{}'", eventLog.getEventId(), t));
+  }
+
+  /**
+   * Deletes outbox logs by event ids in batch.
+   *
+   * @param conn     the sql connection from transaction
+   * @param eventIds the event ids to delete
+   * @param tenantId the tenant id
+   * @return future of row count for deleted records
+   */
+  public Future<Integer> deleteEventLogs(Conn conn, List<String> eventIds, String tenantId) {
+    log.debug("deleteEventLogs:: Deleting outbox logs by event ids in batch: '{}'", eventIds);
+    var tableName = getTenantTableName(tenantId, OUTBOX_TABLE_NAME);
+    var param = eventIds.stream().map(UUID::fromString).toArray(UUID[]::new);
+    return conn.execute(BATCH_DELETE.formatted(tableName), Tuple.of(param))
+      .map(SqlResult::rowCount)
+      .onFailure(t -> log.warn("deleteEventLogs: Failed to delete event logs by ids: '{}'", eventIds, t));
+  }
+
+}
diff --git a/src/main/java/org/folio/dao/lock/InternalLockDAO.java b/src/main/java/org/folio/dao/lock/InternalLockDAO.java
new file mode 100644
index 00000000..e1069686
--- /dev/null
+++ b/src/main/java/org/folio/dao/lock/InternalLockDAO.java
@@ -0,0 +1,11 @@
+package org.folio.dao.lock;
+
+import org.folio.rest.persist.Conn;
+
+import io.vertx.core.Future;
+
+public interface InternalLockDAO {
+
+  Future<Integer> selectWithLocking(Conn conn, String lockName, String tenantId);
+
+}
diff --git a/src/main/java/org/folio/dao/lock/InternalLockPostgresDAO.java b/src/main/java/org/folio/dao/lock/InternalLockPostgresDAO.java
new file mode 100644
index 00000000..170cf417
--- /dev/null
+++ b/src/main/java/org/folio/dao/lock/InternalLockPostgresDAO.java
@@ -0,0 +1,34 @@
+package org.folio.dao.lock;
+
+import static org.folio.dao.DbUtils.getTenantTableName;
+
+import org.folio.rest.persist.Conn;
+
+import io.vertx.core.Future;
+import io.vertx.sqlclient.SqlResult;
+import io.vertx.sqlclient.Tuple;
+import lombok.extern.log4j.Log4j2;
+
+@Log4j2
+public class InternalLockPostgresDAO implements InternalLockDAO {
+
+  private static final String LOCK_TABLE_NAME = "internal_lock";
+  private static final String SELECT_WITH_LOCKING = "SELECT * FROM %s WHERE lock_name = $1 FOR UPDATE";
+
+  /**
+   * Performs SELECT FOR UPDATE statement in order to implement locking.
+   * Lock released after the transaction is committed.
+   *
+   * @param conn connection with active transaction
+   * @param lockName the lock name
+   * @param tenantId the tenant id
+   * @return future with 1 row if lock was acquired
+   */
+  public Future<Integer> selectWithLocking(Conn conn, String lockName, String tenantId) {
+    log.debug("selectWithLocking:: Locking row with lockName: '{}'", lockName);
+    var tableName = getTenantTableName(tenantId, LOCK_TABLE_NAME);
+    return conn.execute(SELECT_WITH_LOCKING.formatted(tableName), Tuple.of(lockName))
+      .map(SqlResult::rowCount)
+      .onFailure(t -> log.warn("selectWithLocking:: Unable to select row with lockName: '{}'", lockName, t));
+  }
+}