diff --git a/src/main/java/org/opentosca/csarrepo/model/CsarFile.java b/src/main/java/org/opentosca/csarrepo/model/CsarFile.java
index ad8fe0f..3bcb73c 100644
--- a/src/main/java/org/opentosca/csarrepo/model/CsarFile.java
+++ b/src/main/java/org/opentosca/csarrepo/model/CsarFile.java
@@ -1,7 +1,6 @@
 package org.opentosca.csarrepo.model;
 
 import java.util.Date;
-import java.util.UUID;
 
 import javax.persistence.Column;
 import javax.persistence.Entity;
@@ -25,25 +24,19 @@ public class CsarFile {
 
 	@Id
 	@GeneratedValue(strategy = GenerationType.AUTO)
-	@Column(name = "id")
+	@Column(name = "csar_file_id")
 	private long id;
 
 	@ManyToOne(fetch = FetchType.EAGER)
 	@JoinColumn(name = "csar_id")
 	private Csar csar;
 
-	@Column(name = "size")
-	private long size;
-
 	@Column(name = "version")
 	private String version;
 
 	@Column(name = "upload_date")
 	private Date uploadDate;
 
-	@Column(name = "file_id")
-	private UUID fileId;
-
 	@Column(name = "name")
 	private String name;
 
@@ -84,24 +77,6 @@ public Csar getCsar() {
 		return csar;
 	}
 
-	/**
-	 * Get the size of a CSAR
-	 *
-	 * @return size
-	 */
-	public long getSize() {
-		return size;
-	}
-
-	/**
-	 * Sets the size of a CSAR
-	 *
-	 * @param size
-	 */
-	public void setSize(long size) {
-		this.size = size;
-	}
-
 	/**
 	 * Gets the version of a CSAR
 	 *
@@ -138,21 +113,6 @@ public void setUploadDate(Date uploadDate) {
 		this.uploadDate = uploadDate;
 	}
 
-	/**
-	 * @return the fileIdForeign
-	 */
-	public UUID getFileId() {
-		return fileId;
-	}
-
-	/**
-	 * @param fileId
-	 *            the fileId to set
-	 */
-	public void setFileId(UUID fileId) {
-		this.fileId = fileId;
-	}
-
 	/**
 	 * @param name
 	 *            the name to set
diff --git a/src/main/java/org/opentosca/csarrepo/model/HashedFile.java b/src/main/java/org/opentosca/csarrepo/model/HashedFile.java
index 1c23acf..7db2b96 100644
--- a/src/main/java/org/opentosca/csarrepo/model/HashedFile.java
+++ b/src/main/java/org/opentosca/csarrepo/model/HashedFile.java
@@ -31,6 +31,9 @@ public class HashedFile {
 	@Column(name = "file_name")
 	private String fileName;
 
+	@Column(name = "size")
+	private String size;
+
 	@OneToMany(fetch = FetchType.EAGER, mappedBy = "hashedFile")
 	private List<CsarFile> csarFiles;
 
@@ -86,6 +89,23 @@ public String getFileName() {
 		return fileName;
 	}
 
+	/**
+	 *
+	 * @param size
+	 *            the size of the hashed file
+	 */
+	public void setSize(String size) {
+		this.size = size;
+	}
+
+	/**
+	 *
+	 * @return the size of the file
+	 */
+	public String getSize() {
+		return size;
+	}
+
 	/**
 	 * Returns all CSAR files of the current CSAR
 	 *
diff --git a/src/main/java/org/opentosca/csarrepo/model/User.java b/src/main/java/org/opentosca/csarrepo/model/User.java
index c4f9f35..8889437 100644
--- a/src/main/java/org/opentosca/csarrepo/model/User.java
+++ b/src/main/java/org/opentosca/csarrepo/model/User.java
@@ -20,6 +20,7 @@ public class User {
 
 	@Id
 	@GeneratedValue(strategy = GenerationType.AUTO)
+	@Column(name = "user_id")
 	private long id;
 
 	@Column(name = "name")
diff --git a/src/main/java/org/opentosca/csarrepo/service/UploadCsarService.java b/src/main/java/org/opentosca/csarrepo/service/UploadCsarService.java
index b2ef6f7..3d4d166 100644
--- a/src/main/java/org/opentosca/csarrepo/service/UploadCsarService.java
+++ b/src/main/java/org/opentosca/csarrepo/service/UploadCsarService.java
@@ -62,9 +62,7 @@ private void storeFile(UUID csarId, InputStream is, String name) {
 
 			CsarFile csarFile = new CsarFile();
 			csarFile.setHashedFile(hashedFile);
-			csarFile.setSize(fs.getFileSize(csarId));
 			csarFile.setVersion("1.0");
-			csarFile.setFileId(csarId);
 			// TODO: set Date correctly
 			// check if file.lastModified() uses same long as Date(long)
 			csarFile.setUploadDate(new Date());
diff --git a/src/main/java/org/opentosca/csarrepo/servlet/CsarDetailsServlet.java b/src/main/java/org/opentosca/csarrepo/servlet/CsarDetailsServlet.java
index b33270d..77f1c88 100644
--- a/src/main/java/org/opentosca/csarrepo/servlet/CsarDetailsServlet.java
+++ b/src/main/java/org/opentosca/csarrepo/servlet/CsarDetailsServlet.java
@@ -37,22 +37,21 @@ public CsarDetailsServlet() {
 	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
 	 *      response)
 	 */
-	protected void doGet(HttpServletRequest request,
-			HttpServletResponse response) throws ServletException, IOException {
+	@Override
+	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 		try {
-			//TODO: length-check
+			// TODO: length-check
 			String[] pathInfo = request.getPathInfo().split("/");
-			//TODO: handle exception
+			// TODO: handle exception
 			long csarId = Long.parseLong(pathInfo[1]); // {id}
 
 			// TODO: add real UserID
 			ShowCsarService showService = new ShowCsarService(0L, csarId);
 			if (showService.hasErrors()) {
 				// FIXME, get all errors - not only first
-				throw new ServletException("csarService has errors:"
-						+ showService.getErrors().get(0));
+				throw new ServletException("csarService has errors:" + showService.getErrors().get(0));
 			}
-			
+
 			Map<String, Object> root = new HashMap<String, Object>();
 			Csar result = showService.getResult();
 			root.put("csar", result);
@@ -65,4 +64,4 @@ protected void doGet(HttpServletRequest request,
 		}
 	}
 
-}
\ No newline at end of file
+}