Adapt to existing beos table in database sternwarte

Column mapping: id, name/vorname, kürzel (with umlaut), pw instead of
the planned schema. DB_NAME changed to sternwarte. create_table.sql
no longer creates beos, only the three new logbuch tables.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

create_table.sql

@@ -1,11 +1,5 @@
-CREATE TABLE beos (
-  ID INT AUTO_INCREMENT PRIMARY KEY,
-  Kuerzel VARCHAR(10) NOT NULL UNIQUE,
-  Name VARCHAR(100) NOT NULL,
-  Passwort VARCHAR(255),
-  MustChangePassword TINYINT(1) DEFAULT 1,
-  created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
-);
+-- Datenbank: sternwarte
+-- Die Tabelle 'beos' ist bereits vorhanden und wird hier nicht neu angelegt.
 
 CREATE TABLE objekte (
   ID INT AUTO_INCREMENT PRIMARY KEY,
@@ -27,7 +21,7 @@ CREATE TABLE logbuch (
   WetterDruck DECIMAL(7,1),
   created_by INT,
   created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
-  FOREIGN KEY (created_by) REFERENCES beos(ID)
+  FOREIGN KEY (created_by) REFERENCES beos(id)
 );
 
 CREATE TABLE logbuch_beos (
@@ -35,7 +29,7 @@ CREATE TABLE logbuch_beos (
   LogbuchID INT NOT NULL,
   BeoID INT NOT NULL,
   FOREIGN KEY (LogbuchID) REFERENCES logbuch(ID) ON DELETE CASCADE,
-  FOREIGN KEY (BeoID) REFERENCES beos(ID)
+  FOREIGN KEY (BeoID) REFERENCES beos(id)
 );
 
 CREATE TABLE logbuch_objekte (