Added UNIQUE constraint on dmID & testEnv entry combination.

src/sqlite/db_tables.cpp

@@ -361,9 +361,9 @@ namespace MsgZfoTbl {
 
 	const QVector< QPair<QString, enum EntryType> > knownAttrs = {
 	{"dmID",  DB_INTEGER}, /* NOT NULL*/
-	{"testEnv", DB_BOOLEAN},
-	{"lastAccessTime", DB_INTEGER},
-	{"size", DB_INTEGER},
+	{"testEnv", DB_BOOLEAN}, /* NOT NULL */
+	{"lastAccessTime", DB_INTEGER}, /* NOT NULL*/
+	{"size", DB_INTEGER}, /* NOT NULL*/
 	{"data", DB_TEXT}
 	/*
 	 * PRIMARY KEY (id),
@@ -372,13 +372,16 @@ namespace MsgZfoTbl {
 	};
 
 	const QMap<QString, QString> colConstraints = {
-	    {"dmID", "NOT NULL"}
+	    {"dmID", "NOT NULL"},
+	    {"testEnv", "NOT NULL"},
+	    {"lastAccessTime", "NOT NULL"},
+	    {"size", "NOT NULL"}
 	};
 
 	const QString &tblConstraint(
 	    ",\n"
 	    "        CHECK (testEnv IN (0, 1)),\n"
-	    "        FOREIGN KEY(dmID) REFERENCES messages (dmID)"
+	    "        UNIQUE (dmID, testEnv)"
 	);
 
 	const QMap<QString, SQLiteTbl::AttrProp> attrProps = {