Support more operation in database

script/sql/create/operation.sql

@@ -15,3 +15,14 @@ CREATE TABLE CURRENT_OPERATION
 );
 
 INSERT INTO CURRENT_OPERATION (ID) VALUES (0);
+
+CREATE TABLE SNAPSHOT_OPERATION
+(
+  ID INTEGER PRIMARY KEY REFERENCES OPERATION(ID)
+, Tag TEXT NOT NULL UNIQUE
+);
+
+CREATE TABLE TRANSACTION_OPERATION
+(
+  ID INTEGER PRIMARY KEY REFERENCES OPERATION(ID)
+);

script/sql/drop/operation.sql

@@ -1,3 +1,7 @@
+DROP TABLE TRANSACTION_OPERATION;
+
+DROP TABLE SNAPSHOT_OPERATION;
+
 DROP TABLE CURRENT_OPERATION;
 
 DROP TABLE OPERATION;