diff --git a/CometServer/Helpers/Cdp4TransactionManager.cs b/CometServer/Helpers/Cdp4TransactionManager.cs
index ffb9af33..78d0585e 100644
--- a/CometServer/Helpers/Cdp4TransactionManager.cs
+++ b/CometServer/Helpers/Cdp4TransactionManager.cs
@@ -44,9 +44,7 @@ namespace CometServer.Helpers
     using ServiceUtils = Services.Utils;
 
     /// <summary>
-    /// The purpose of the <see cref="Cdp4TransactionManager"/> is provide a <see cref="NpgsqlTransaction"/> for
-    /// read and write operations to the database while configuring the database to properly process
-    /// any temporal database interactions
+    /// A wrapper class for the <see cref="NpgsqlTransaction"/> class, allowing temporal database interaction.
     /// </summary>
     public class Cdp4TransactionManager : ICdp4TransactionManager
     {
@@ -110,11 +108,6 @@ public class Cdp4TransactionManager : ICdp4TransactionManager
         /// </summary>
         private bool isFullAccessGranted;
 
-        /// <summary>
-        /// Backing field for the cached rawSessionInstant value
-        /// </summary>
-        private object rawSessionInstant;
-
         /// <summary>
         /// Gets or sets the iteration setup dao.
         /// </summary>
@@ -130,14 +123,6 @@ public class Cdp4TransactionManager : ICdp4TransactionManager
         /// </summary>
         public IterationSetup IterationSetup { get; private set; }
 
-        /// <summary>
-        /// Initializes a new instance of the <see cref="Cdp4TransactionManager"/>
-        /// </summary>
-        public Cdp4TransactionManager()
-        {
-            this.rawSessionInstant = null;
-        }
-
         /// <summary>
         /// The setup transaction.
         /// </summary>
@@ -183,17 +168,13 @@ public NpgsqlTransaction SetupTransaction(ref NpgsqlConnection connection, Crede
         }
 
         /// <summary>
-        /// Get the current session time instant value from the database. In case the most current data is to be
-        /// retrieved this value returns (+infinity) which translates to <see cref="DateTime.MaxValue"/>. In case
-        /// a request is made related to time-travel the <see cref="DateTime"/> corresponding to the period_end
-        /// is returned
+        /// Get the current session time instant.
         /// </summary>
         /// <param name="transaction">
         /// The current transaction to the database.
         /// </param>
         /// <returns>
-        /// A <see cref="DateTime"/> that represents the session Instant (either <see cref="DateTime.MaxValue"/> or
-        /// the <see cref="DateTime"/> corresponding to the period_end
+        /// The <see cref="DateTime"/>.
         /// </returns>
         public DateTime GetSessionInstant(NpgsqlTransaction transaction)
         {
@@ -201,31 +182,23 @@ public DateTime GetSessionInstant(NpgsqlTransaction transaction)
         }
 
         /// <summary>
-        /// Get the raw current session time instant value from the database. In case the most current data is to be
-        /// retrieved this value returns (+infinity) which translates to <see cref="DateTime.MaxValue"/>. In case
-        /// a request is made related to time-travel the <see cref="DateTime"/> corresponding to the period_end
-        /// is returned
+        /// Get the raw current session time instant value from the database.
         /// </summary>
         /// <param name="transaction">
         /// The current transaction to the database.
         /// </param>
         /// <returns>
-        /// A <see cref="object"/> that represents the session Instant (either <see cref="DateTime.MaxValue"/> or
-        /// the <see cref="DateTime"/> corresponding to the period_end
+        /// The <see cref="object"/>.
         /// </returns>
         public object GetRawSessionInstant(NpgsqlTransaction transaction)
         {
-            if (this.rawSessionInstant == null)
-            {
-                using var command = new NpgsqlCommand(
-                    "SELECT * FROM \"SiteDirectory\".\"get_session_instant\"();",
-                    transaction.Connection,
-                    transaction);
-
-                this.rawSessionInstant = command.ExecuteScalar();
+            using (var command = new NpgsqlCommand(
+                       "SELECT * FROM \"SiteDirectory\".\"get_session_instant\"();",
+                       transaction.Connection,
+                       transaction))
+            { 
+                return command.ExecuteScalar();
             }
-
-            return this.rawSessionInstant;
         }
 
         /// <summary>
@@ -283,41 +256,61 @@ public bool IsFullAccessEnabled()
         }
 
         /// <summary>
-        /// Get the timestamp in the form of a <see cref="DateTime"/> that the <see cref="NpgsqlTransaction"/> was
-        /// created using the <see cref="SetupTransaction"/> method.
+        /// Get the session timeframe start time.
         /// </summary>
         /// <param name="transaction">
-        /// The active <see cref="NpgsqlTransaction"/>
+        /// The current transaction to the database.
         /// </param>
         /// <returns>
         /// The <see cref="DateTime"/>.
         /// </returns>
-        public DateTime GetTransactionTime(NpgsqlTransaction transaction)
+        public DateTime GetSessionTimeFrameStart(NpgsqlTransaction transaction)
         {
-            using var command = new NpgsqlCommand(
-                $"SELECT * FROM \"SiteDirectory\".\"{"get_transaction_time"}\"();",
+            using (var command = new NpgsqlCommand(
+                string.Format("SELECT * FROM \"SiteDirectory\".\"{0}\"();", "get_session_timeframe_start"),
                 transaction.Connection,
-                transaction);
+                transaction))
+            { 
+                return (DateTime)command.ExecuteScalar();
+            }
+        }
 
-            return (DateTime)command.ExecuteScalar();
+        /// <summary>
+        /// Get the current transaction time.
+        /// </summary>
+        /// <param name="transaction">
+        /// The current transaction to the database.
+        /// </param>
+        /// <returns>
+        /// The <see cref="DateTime"/>.
+        /// </returns>
+        public DateTime GetTransactionTime(NpgsqlTransaction transaction)
+        {
+            using (var command = new NpgsqlCommand(
+                        string.Format("SELECT * FROM \"SiteDirectory\".\"{0}\"();", "get_transaction_time"),
+                        transaction.Connection,
+                        transaction))
+            {
+                return (DateTime)command.ExecuteScalar();
+            }
         }
 
         /// <summary>
-        /// Sets the default temporal context (-infinity, +infinity)
+        /// The set default context.
         /// </summary>
         /// <param name="transaction">
-        /// The active <see cref="NpgsqlTransaction"/>
+        /// The current transaction to the database.
         /// </param>
         public void SetDefaultContext(NpgsqlTransaction transaction)
         {
             var sqlBuilder = new StringBuilder();
-
             sqlBuilder.AppendFormat(
                 "UPDATE {0} SET ({1}, {2}) = ('-infinity', 'infinity');", TransactionInfoTable, PeriodStartColumn, PeriodEndColumn);
-
-            using var command = new NpgsqlCommand(sqlBuilder.ToString(), transaction.Connection, transaction);
-
-            command.ExecuteNonQuery();
+            
+            using (var command = new NpgsqlCommand(sqlBuilder.ToString(), transaction.Connection, transaction))
+            {
+                command.ExecuteNonQuery();
+            }
         }
 
         /// <summary>
@@ -333,11 +326,12 @@ public void SetAuditLoggingState(NpgsqlTransaction transaction, bool enabled)
         {
             var sql = $"UPDATE {TransactionInfoTable} SET {TransactionAuditEnabled} = :{TransactionAuditEnabled};";
 
-            using var command = new NpgsqlCommand(sql, transaction.Connection, transaction);
-
-            command.Parameters.Add($"{TransactionAuditEnabled}", NpgsqlDbType.Boolean).Value = enabled;
+            using (var command = new NpgsqlCommand(sql, transaction.Connection, transaction))
+            {
+                command.Parameters.Add($"{TransactionAuditEnabled}", NpgsqlDbType.Boolean).Value = enabled;
 
-            command.ExecuteNonQuery();
+                command.ExecuteNonQuery();
+            }
         }
 
         /// <summary>
@@ -388,8 +382,6 @@ public void SetIterationContext(NpgsqlTransaction transaction, string partition,
         /// </returns>
         private NpgsqlTransaction GetTransaction(ref NpgsqlConnection connection, Credentials credentials)
         {
-            this.rawSessionInstant = null;
-
             var transaction = this.SetupNewTransaction(ref connection);
             CreateTransactionInfoTable(transaction);
             CreateDefaultTransactionInfoEntry(transaction, credentials);
@@ -425,11 +417,12 @@ private static void ApplyIterationContext(NpgsqlTransaction transaction, string
             sqlBuilder.AppendFormat("FROM \"{0}\".\"IterationRevisionLog\" iteration_log LEFT JOIN \"{0}\".\"RevisionRegistry\" revision_from ON iteration_log.\"FromRevision\" = revision_from.\"Revision\" LEFT JOIN \"{0}\".\"RevisionRegistry\" revision_to ON iteration_log.\"ToRevision\" = revision_to.\"Revision\") IterationLogRevision", partition);
             sqlBuilder.Append("  WHERE \"IterationIid\" = :iterationIid);");
 
-            using var command = new NpgsqlCommand(sqlBuilder.ToString(), transaction.Connection, transaction);
-
-            command.Parameters.Add("iterationIid", NpgsqlDbType.Uuid).Value = iterationSetup.IterationIid;
+            using (var command = new NpgsqlCommand(sqlBuilder.ToString(), transaction.Connection, transaction))
+            {
+                command.Parameters.Add("iterationIid", NpgsqlDbType.Uuid).Value = iterationSetup.IterationIid;
 
-            command.ExecuteNonQuery();
+                command.ExecuteNonQuery();
+            }
         }
 
         /// <summary>
@@ -479,56 +472,58 @@ private NpgsqlTransaction SetupNewTransaction(ref NpgsqlConnection connection)
         }
 
         /// <summary>
-        /// Create a transaction info table with transaction scope lifetime.
+        /// The create default transaction info entry.
         /// </summary>
         /// <param name="transaction">
         /// The current transaction to the database.
         /// </param>
-        private static void CreateTransactionInfoTable(NpgsqlTransaction transaction)
+        /// <param name="credentials">
+        /// The credentials.
+        /// </param>
+        private static void CreateDefaultTransactionInfoEntry(NpgsqlTransaction transaction, Credentials credentials)
         {
-            // setup transaction_info table that is valid only for this transaction
+            // insert actor from the request credentials otherwise use default (null) user
             var sqlBuilder = new StringBuilder();
+            var isCredentialSet = credentials != null;
 
-            sqlBuilder.AppendFormat("CREATE TEMPORARY TABLE {0} (", TransactionInfoTable);
-            sqlBuilder.AppendFormat("{0} uuid, ", UserIdColumn);
-            sqlBuilder.AppendFormat("{0} timestamp NOT NULL DEFAULT '-infinity', ", PeriodStartColumn);
-            sqlBuilder.AppendFormat("{0} timestamp NOT NULL DEFAULT 'infinity', ", PeriodEndColumn);
-            sqlBuilder.AppendFormat("{0} timestamp NOT NULL DEFAULT 'infinity', ", InstantColumn);
-            sqlBuilder.AppendFormat("{0} timestamp NOT NULL DEFAULT statement_timestamp(), ", TransactionTimeColumn);
-            sqlBuilder.AppendFormat("{0} boolean NOT NULL DEFAULT 'true'", TransactionAuditEnabled);
-            sqlBuilder.Append(") ON COMMIT DROP;");
+            sqlBuilder.AppendFormat("INSERT INTO {0} ({1}, {2})", TransactionInfoTable, UserIdColumn, TransactionTimeColumn);
+            sqlBuilder.AppendFormat(" VALUES({0}, statement_timestamp());", isCredentialSet ? $":{UserIdColumn}" : "null");
 
-            using var command = new NpgsqlCommand(sqlBuilder.ToString(), transaction.Connection, transaction);
+            using (var command = new NpgsqlCommand(sqlBuilder.ToString(), transaction.Connection, transaction))
+            {
+                if (isCredentialSet)
+                {
+                    command.Parameters.Add(UserIdColumn, NpgsqlDbType.Uuid).Value = credentials.Person.Iid;
+                }
 
-            command.ExecuteNonQuery();
+                command.ExecuteNonQuery();
+            }
         }
 
         /// <summary>
-        /// The create default transaction info entry.
+        /// Create a transaction info table with transaction scope lifetime.
         /// </summary>
         /// <param name="transaction">
         /// The current transaction to the database.
         /// </param>
-        /// <param name="credentials">
-        /// The credentials.
-        /// </param>
-        private static void CreateDefaultTransactionInfoEntry(NpgsqlTransaction transaction, Credentials credentials)
+        private static void CreateTransactionInfoTable(NpgsqlTransaction transaction)
         {
-            // insert actor from the request credentials otherwise use default (null) user
+            // setup transaction_info table that is valid only for this transaction
             var sqlBuilder = new StringBuilder();
-            var isCredentialSet = credentials != null;
 
-            sqlBuilder.AppendFormat("INSERT INTO {0} ({1}, {2})", TransactionInfoTable, UserIdColumn, TransactionTimeColumn);
-            sqlBuilder.AppendFormat(" VALUES({0}, statement_timestamp());", isCredentialSet ? $":{UserIdColumn}" : "null");
-
-            using var command = new NpgsqlCommand(sqlBuilder.ToString(), transaction.Connection, transaction);
+            sqlBuilder.AppendFormat("CREATE TEMPORARY TABLE {0} (", TransactionInfoTable);
+            sqlBuilder.AppendFormat("{0} uuid, ", UserIdColumn);
+            sqlBuilder.AppendFormat("{0} timestamp NOT NULL DEFAULT '-infinity', ", PeriodStartColumn);
+            sqlBuilder.AppendFormat("{0} timestamp NOT NULL DEFAULT 'infinity', ", PeriodEndColumn);
+            sqlBuilder.AppendFormat("{0} timestamp NOT NULL DEFAULT 'infinity', ", InstantColumn);
+            sqlBuilder.AppendFormat("{0} timestamp NOT NULL DEFAULT statement_timestamp(), ", TransactionTimeColumn);
+            sqlBuilder.AppendFormat("{0} boolean NOT NULL DEFAULT 'true'", TransactionAuditEnabled);
+            sqlBuilder.Append(") ON COMMIT DROP;");
 
-            if (isCredentialSet)
+            using (var command = new NpgsqlCommand(sqlBuilder.ToString(), transaction.Connection, transaction))
             {
-                command.Parameters.Add(UserIdColumn, NpgsqlDbType.Uuid).Value = credentials.Person.Iid;
+                command.ExecuteNonQuery();
             }
-
-            command.ExecuteNonQuery();
         }
     }
 }
diff --git a/CometServer/Helpers/ICdp4TransactionManager.cs b/CometServer/Helpers/ICdp4TransactionManager.cs
index c26fac6a..ced3d2fa 100644
--- a/CometServer/Helpers/ICdp4TransactionManager.cs
+++ b/CometServer/Helpers/ICdp4TransactionManager.cs
@@ -28,14 +28,14 @@ namespace CometServer.Helpers
 
     using CDP4Common.DTO;
     
+    using CDP4Orm.Dao;
+
     using CometServer.Authorization;
 
     using Npgsql;
 
     /// <summary>
-    /// The purpose of the <see cref="ICdp4TransactionManager"/> is provide a <see cref="NpgsqlTransaction"/> for
-    /// read and write operations to the database while configuring the database to properly process
-    /// any temporal database interactions
+    /// A wrapper interface for the <see cref="NpgsqlTransaction"/> class, allowing temporal database interaction.
     /// </summary>
     public interface ICdp4TransactionManager
     {
@@ -68,8 +68,7 @@ public interface ICdp4TransactionManager
         /// The user credential information for this request
         /// </param>
         /// <param name="iterationIid">
-        /// the unique identifier of the <see cref="Iteration"/> which is used to retrieve and set the
-        /// corresponding <see cref="IterationSetup"/>
+        /// An optional iteration id that can be supplied to set the transaction context to the iteration
         /// </param>
         /// <returns>
         /// The <see cref="NpgsqlTransaction"/>.
@@ -77,44 +76,46 @@ public interface ICdp4TransactionManager
         NpgsqlTransaction SetupTransaction(ref NpgsqlConnection connection, Credentials credentials, Guid iterationIid);
 
         /// <summary>
-        /// Get the timestamp in the form of a <see cref="DateTime"/> that the <see cref="NpgsqlTransaction"/> was
-        /// created using the <see cref="SetupTransaction"/> method.
+        /// Get the current transaction time.
         /// </summary>
         /// <param name="transaction">
-        /// The active <see cref="NpgsqlTransaction"/>
+        /// The transaction.
         /// </param>
         /// <returns>
         /// The <see cref="DateTime"/>.
         /// </returns>
         DateTime GetTransactionTime(NpgsqlTransaction transaction);
+        
+        /// <summary>
+        /// Get the session timeframe start time.
+        /// </summary>
+        /// <param name="transaction">
+        /// The transaction.
+        /// </param>
+        /// <returns>
+        /// The <see cref="DateTime"/>.
+        /// </returns>
+        DateTime GetSessionTimeFrameStart(NpgsqlTransaction transaction);
 
         /// <summary>
-        /// Get the current session time instant value from the database. In case the most current data is to be
-        /// retrieved this value returns (+infinity) which translates to <see cref="DateTime.MaxValue"/>. In case
-        /// a request is made related to time-travel the <see cref="DateTime"/> corresponding to the period_end
-        /// is returned
+        /// Get the current session time instant.
         /// </summary>
         /// <param name="transaction">
-        /// The current transaction to the database.
+        /// The transaction.
         /// </param>
         /// <returns>
-        /// A <see cref="DateTime"/> that represents the session Instant (either <see cref="DateTime.MaxValue"/> or
-        /// the <see cref="DateTime"/> corresponding to the period_end
+        /// The <see cref="DateTime"/>.
         /// </returns>
         DateTime GetSessionInstant(NpgsqlTransaction transaction);
 
         /// <summary>
-        /// Get the raw current session time instant value from the database. In case the most current data is to be
-        /// retrieved this value returns (+infinity) which translates to <see cref="DateTime.MaxValue"/>. In case
-        /// a request is made related to time-travel the <see cref="DateTime"/> corresponding to the period_end
-        /// is returned
+        /// Get the raw current session time instant value from the database.
         /// </summary>
         /// <param name="transaction">
-        /// The current transaction to the database.
+        /// The transaction.
         /// </param>
         /// <returns>
-        /// A <see cref="object"/> that represents the session Instant (either <see cref="DateTime.MaxValue"/> or
-        /// the <see cref="DateTime"/> corresponding to the period_end
+        /// The current session instant as an <see cref="object"/>.
         /// </returns>
         object GetRawSessionInstant(NpgsqlTransaction transaction);
 
@@ -149,10 +150,10 @@ public interface ICdp4TransactionManager
         void SetAuditLoggingState(NpgsqlTransaction transaction, bool enabled);
 
         /// <summary>
-        /// Sets the default temporal context (-infinity, +infinity)
+        /// The set default context.
         /// </summary>
         /// <param name="transaction">
-        /// The active <see cref="NpgsqlTransaction"/>
+        /// The transaction.
         /// </param>
         void SetDefaultContext(NpgsqlTransaction transaction);