implemented resetting passwords

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

src/main/java/de/srsoftware/widerhall/data/Database.java

@@ -10,6 +10,7 @@ import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.*;
 
+import static de.srsoftware.widerhall.Constants.*;
 import static de.srsoftware.widerhall.Util.t;
 import static de.srsoftware.widerhall.data.MailingList.HOLD_TIME;
 
@@ -19,6 +20,7 @@ import static de.srsoftware.widerhall.data.MailingList.HOLD_TIME;
  */
 public class Database {
     private static final Logger LOG = LoggerFactory.getLogger(Database.class);
+    private static final String DB_VERSION = "db_version";
     private static Database singleton = null; // we only need one db handle ever. This will be it.
     private final Connection conn; // the actual db connection handle within the singleton
 
@@ -295,6 +297,14 @@ public class Database {
         return this;
     }
 
+    private void createVersionTable() throws SQLException {
+            var sql = "CREATE TABLE %s (%s %s NOT NULL PRIMARY KEY);".formatted(DB_VERSION,DB_VERSION,INT);
+            var db = Database.open();
+            db.query(sql).compile().run();
+            sql = "INSERT INTO %s VALUES (1)".formatted(DB_VERSION);
+            db.query(sql).compile().run();
+    }
+
     private boolean columnExists(String tableName, String columnName) throws SQLException {
         var rs = Database.open().select("pragma_table_info('"+tableName+"')","COUNT(*) AS num").where("name",columnName).compile().exec();
         try {
@@ -357,6 +367,7 @@ public class Database {
             try {
                 singleton = new Database(DriverManager.getConnection(url));
                 singleton.assertTables(); // must not be concatenated to exception above (assertTables accesses singleton)!
+                singleton.update202405();
             } catch (SQLException sqle) {
                 sqle.printStackTrace();
             }
@@ -373,6 +384,10 @@ public class Database {
         return new Request(sql);
     }
 
+    public Request query(String sql) {
+        return new Request(new StringBuilder(sql));
+    }
+
     /**
      * create a SELECT [flields] FROM [table] request.
      * If no fields are supplied, a request in the form SELECT * FROM [table] will be generated.
@@ -390,7 +405,6 @@ public class Database {
         return new Request(sql.append(" FROM ").append(tableName));
     }
 
-
     /**
      * check, whether a table with the provided name exists
      * @param tbName
@@ -420,4 +434,12 @@ public class Database {
     public Request update(String tableName) {
         return new Request(new StringBuilder("UPDATE ").append(tableName));
     }
+
+    private Database update202405() throws SQLException {
+        if (!tableExists(Database.DB_VERSION)) {
+            createVersionTable();
+            User.addTokenColumn();
+        }
+        return this;
+    }
 }