diff --git a/resources/dbbasis.proto b/resources/dbbasis.proto
new file mode 100644
index 0000000..952c882
--- /dev/null
+++ b/resources/dbbasis.proto
@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package com.xtdb.protos;
+import "common.proto";
+
+message DbBasisRequest {
+    OptionInt64 tx_id = 1;
+    OptionDatetime valid_time = 2;
+    OptionDatetime tx_time = 3;
+}
+
+message DbBasisResponse {
+    string xt_id = 1;
+    string content = 2;
+}
diff --git a/resources/service.proto b/resources/service.proto
index 626f3af..7852e56 100644
--- a/resources/service.proto
+++ b/resources/service.proto
@@ -5,7 +5,7 @@ package com.xtdb.protos;
 import "transactions.proto";
 import "entity.proto";
 import "common.proto";
-
+import "dbbasis.proto";
 
 message StatusResponse {
   string version = 1;
@@ -17,15 +17,6 @@ message StatusResponse {
   OptionString consumer_state = 7;
 }
 
-message DbBasisRequest {
-  bool open_snapshot = 1;
-}
-
-message DbBasisResponse {
-  string valid_time = 1;
-  int64 tx_id = 2;
-}
-
 service GrpcApi {
   rpc Status(Empty) returns (StatusResponse);
   rpc SubmitTx(com.xtdb.protos.SubmitRequest)
@@ -36,6 +27,6 @@ service GrpcApi {
       returns (com.xtdb.protos.EntityTxResponse);
   rpc Entity(com.xtdb.protos.EntityRequest)
       returns (com.xtdb.protos.EntityResponse);
-  rpc DbBasis(DbBasisRequest)
-      returns(DbBasisResponse);
+  rpc DbBasis(com.xtdb.protos.DbBasisRequest)
+      returns(com.xtdb.protos.DbBasisResponse);
 }
diff --git a/src/com/xtdb/protos.cljc b/src/com/xtdb/protos.cljc
index 767a4b5..fa18873 100644
--- a/src/com/xtdb/protos.cljc
+++ b/src/com/xtdb/protos.cljc
@@ -206,22 +206,23 @@
 ;-----------------------------------------------------------------------------
 ; DbBasisRequest
 ;-----------------------------------------------------------------------------
-(defrecord DbBasisRequest-record [open-snapshot]
+(defrecord DbBasisRequest-record [tx-id valid-time tx-time]
   pb/Writer
   (serialize [this os]
-    (serdes.core/write-Bool 1  {:optimize true} (:open-snapshot this) os))
+    (serdes.core/write-embedded 1 (:tx-id this) os)
+    (serdes.core/write-embedded 2 (:valid-time this) os)
+    (serdes.core/write-embedded 3 (:tx-time this) os))
   pb/TypeReflection
   (gettype [this]
     "com.xtdb.protos.DbBasisRequest"))
 
-(s/def :com.xtdb.protos.DbBasisRequest/open-snapshot boolean?)
-(s/def ::DbBasisRequest-spec (s/keys :opt-un [:com.xtdb.protos.DbBasisRequest/open-snapshot]))
-(def DbBasisRequest-defaults {:open-snapshot false})
+(s/def ::DbBasisRequest-spec (s/keys :opt-un []))
+(def DbBasisRequest-defaults {})
 
 (defn cis->DbBasisRequest
   "CodedInputStream to DbBasisRequest"
   [is]
-  (map->DbBasisRequest-record (tag-map DbBasisRequest-defaults (fn [tag index] (case index 1 [:open-snapshot (serdes.core/cis->Bool is)] [index (serdes.core/cis->undefined tag is)])) is)))
+  (map->DbBasisRequest-record (tag-map DbBasisRequest-defaults (fn [tag index] (case index 1 [:tx-id (ecis->OptionInt64 is)] 2 [:valid-time (ecis->OptionDatetime is)] 3 [:tx-time (ecis->OptionDatetime is)] [index (serdes.core/cis->undefined tag is)])) is)))
 
 (defn ecis->DbBasisRequest
   "Embedded CodedInputStream to DbBasisRequest"
@@ -234,7 +235,11 @@
   "
   [init]
   {:pre [(if (s/valid? ::DbBasisRequest-spec init) true (throw (ex-info "Invalid input" (s/explain-data ::DbBasisRequest-spec init))))]}
-  (map->DbBasisRequest-record (merge DbBasisRequest-defaults init)))
+  (-> (merge DbBasisRequest-defaults init)
+      (cond-> (some? (get init :tx-id)) (update :tx-id new-OptionInt64))
+      (cond-> (some? (get init :valid-time)) (update :valid-time new-OptionDatetime))
+      (cond-> (some? (get init :tx-time)) (update :tx-time new-OptionDatetime))
+      (map->DbBasisRequest-record)))
 
 (defn pb->DbBasisRequest
   "Protobuf to DbBasisRequest"
@@ -573,24 +578,24 @@
 ;-----------------------------------------------------------------------------
 ; DbBasisResponse
 ;-----------------------------------------------------------------------------
-(defrecord DbBasisResponse-record [valid-time tx-id]
+(defrecord DbBasisResponse-record [xt-id content]
   pb/Writer
   (serialize [this os]
-    (serdes.core/write-String 1  {:optimize true} (:valid-time this) os)
-    (serdes.core/write-Int64 2  {:optimize true} (:tx-id this) os))
+    (serdes.core/write-String 1  {:optimize true} (:xt-id this) os)
+    (serdes.core/write-String 2  {:optimize true} (:content this) os))
   pb/TypeReflection
   (gettype [this]
     "com.xtdb.protos.DbBasisResponse"))
 
-(s/def :com.xtdb.protos.DbBasisResponse/valid-time string?)
-(s/def :com.xtdb.protos.DbBasisResponse/tx-id int?)
-(s/def ::DbBasisResponse-spec (s/keys :opt-un [:com.xtdb.protos.DbBasisResponse/valid-time :com.xtdb.protos.DbBasisResponse/tx-id]))
-(def DbBasisResponse-defaults {:valid-time "" :tx-id 0})
+(s/def :com.xtdb.protos.DbBasisResponse/xt-id string?)
+(s/def :com.xtdb.protos.DbBasisResponse/content string?)
+(s/def ::DbBasisResponse-spec (s/keys :opt-un [:com.xtdb.protos.DbBasisResponse/xt-id :com.xtdb.protos.DbBasisResponse/content]))
+(def DbBasisResponse-defaults {:xt-id "" :content ""})
 
 (defn cis->DbBasisResponse
   "CodedInputStream to DbBasisResponse"
   [is]
-  (map->DbBasisResponse-record (tag-map DbBasisResponse-defaults (fn [tag index] (case index 1 [:valid-time (serdes.core/cis->String is)] 2 [:tx-id (serdes.core/cis->Int64 is)] [index (serdes.core/cis->undefined tag is)])) is)))
+  (map->DbBasisResponse-record (tag-map DbBasisResponse-defaults (fn [tag index] (case index 1 [:xt-id (serdes.core/cis->String is)] 2 [:content (serdes.core/cis->String is)] [index (serdes.core/cis->undefined tag is)])) is)))
 
 (defn ecis->DbBasisResponse
   "Embedded CodedInputStream to DbBasisResponse"