diff --git a/src/main/scala/model/BaseTable.scala b/src/main/scala/model/BaseTable.scala
new file mode 100644
index 0000000..ebe986d
--- /dev/null
+++ b/src/main/scala/model/BaseTable.scala
@@ -0,0 +1,15 @@
+package model
+
+import scala.slick.driver.H2Driver.simple._
+
+protected[model] abstract class BaseTable[T](_tableName: String) extends Table[T](_tableName) {
+  def userName = column[String]("USER_NAME")
+  def repositoryName = column[String]("REPOSITORY_NAME")
+  def base = userName ~ repositoryName
+
+  def repository(owner: String, repository: String) =
+    (userName is owner.bind) && (repositoryName is repository.bind)
+
+  def repository(other: BaseTable[T]) =
+    (userName is other.userName) && (repositoryName is other.repositoryName)
+}
diff --git a/src/main/scala/model/Collaborator.scala b/src/main/scala/model/Collaborator.scala
index 9d0d3b9..644e775 100644
--- a/src/main/scala/model/Collaborator.scala
+++ b/src/main/scala/model/Collaborator.scala
@@ -1,12 +1,11 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
+import model.{BaseTable => Table}
 
 object Collaborators extends Table[Collaborator]("COLLABORATOR") {
-  def userName = column[String]("USER_NAME", O PrimaryKey)
-  def repositoryName = column[String]("REPOSITORY_NAME")
   def collaboratorName = column[String]("COLLABORATOR_NAME")
-  def * = userName ~ repositoryName ~ collaboratorName <> (Collaborator, Collaborator.unapply _)
+  def * = base ~ collaboratorName <> (Collaborator, Collaborator.unapply _)
 }
 
 case class Collaborator(
diff --git a/src/main/scala/model/Issue.scala b/src/main/scala/model/Issue.scala
index 7c48cbe..5de5312 100644
--- a/src/main/scala/model/Issue.scala
+++ b/src/main/scala/model/Issue.scala
@@ -1,18 +1,15 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
+import model.{BaseTable => Table}
 
 object IssueId extends Table[(String, String, Int)]("ISSUE_ID") {
-  def userName = column[String]("USER_NAME", O PrimaryKey)
-  def repositoryName = column[String]("REPOSITORY_NAME", O PrimaryKey)
   def issueId = column[Int]("ISSUE_ID")
-  def * = userName ~ repositoryName ~ issueId
+  def * = base ~ issueId
 }
 
 object Issues extends Table[Issue]("ISSUE") with Functions {
-  def userName = column[String]("USER_NAME", O PrimaryKey)
-  def repositoryName = column[String]("REPOSITORY_NAME", O PrimaryKey)
-  def issueId = column[Int]("ISSUE_ID", O PrimaryKey)
+  def issueId = column[Int]("ISSUE_ID")
   def openedUserName = column[String]("OPENED_USER_NAME")
   def milestoneId = column[Int]("MILESTONE_ID")
   def assignedUserName = column[String]("ASSIGNED_USER_NAME")
@@ -21,7 +18,7 @@
   def closed = column[Boolean]("CLOSED")
   def registeredDate = column[java.util.Date]("REGISTERED_DATE")
   def updatedDate = column[java.util.Date]("UPDATED_DATE")
-  def * = userName ~ repositoryName ~ issueId ~ openedUserName ~ milestoneId.? ~ assignedUserName.? ~ title ~ content.? ~ closed ~ registeredDate ~ updatedDate <> (Issue, Issue.unapply _)
+  def * = base ~ issueId ~ openedUserName ~ milestoneId.? ~ assignedUserName.? ~ title ~ content.? ~ closed ~ registeredDate ~ updatedDate <> (Issue, Issue.unapply _)
 }
 
 case class Issue(
diff --git a/src/main/scala/model/IssueComment.scala b/src/main/scala/model/IssueComment.scala
index a8fd761..a3c5c50 100644
--- a/src/main/scala/model/IssueComment.scala
+++ b/src/main/scala/model/IssueComment.scala
@@ -1,19 +1,18 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
+import model.{BaseTable => Table}
 
 object IssueComments extends Table[IssueComment]("ISSUE_COMMENT") with Functions {
-  def userName = column[String]("USER_NAME")
-  def repositoryName = column[String]("REPOSITORY_NAME")
   def issueId = column[Int]("ISSUE_ID")
-  def commentId = column[Int]("COMMENT_ID", O PrimaryKey, O AutoInc)
+  def commentId = column[Int]("COMMENT_ID", O AutoInc)
   def commentedUserName = column[String]("COMMENTED_USER_NAME")
   def content = column[String]("CONTENT")
   def registeredDate = column[java.util.Date]("REGISTERED_DATE")
   def updatedDate = column[java.util.Date]("UPDATED_DATE")
-  def * = userName ~ repositoryName ~ issueId ~ commentId ~ commentedUserName ~ content ~ registeredDate ~ updatedDate <> (IssueComment, IssueComment.unapply _)
+  def * = base ~ issueId ~ commentId ~ commentedUserName ~ content ~ registeredDate ~ updatedDate <> (IssueComment, IssueComment.unapply _)
 
-  def autoInc = userName ~ repositoryName ~ issueId ~ commentedUserName ~ content ~ registeredDate ~ updatedDate returning commentId
+  def autoInc = base ~ issueId ~ commentedUserName ~ content ~ registeredDate ~ updatedDate returning commentId
 }
 
 case class IssueComment(
diff --git a/src/main/scala/model/IssueLabels.scala b/src/main/scala/model/IssueLabels.scala
index a0e87a6..db27dda 100644
--- a/src/main/scala/model/IssueLabels.scala
+++ b/src/main/scala/model/IssueLabels.scala
@@ -1,13 +1,12 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
+import model.{BaseTable => Table}
 
-object IssueLabels extends Table[IssueLabel]("ISSUE_LABEL") with Functions {
-  def userName = column[String]("USER_NAME", O PrimaryKey)
-  def repositoryName = column[String]("REPOSITORY_NAME", O PrimaryKey)
-  def issueId = column[Int]("ISSUE_ID", O PrimaryKey)
-  def labelId = column[Int]("LABEL_ID", O PrimaryKey)
-  def * = userName ~ repositoryName ~ issueId ~ labelId <> (IssueLabel, IssueLabel.unapply _)
+object IssueLabels extends Table[IssueLabel]("ISSUE_LABEL") {
+  def issueId = column[Int]("ISSUE_ID")
+  def labelId = column[Int]("LABEL_ID")
+  def * = base ~ issueId ~ labelId <> (IssueLabel, IssueLabel.unapply _)
 }
 
 case class IssueLabel(
diff --git a/src/main/scala/model/Labels.scala b/src/main/scala/model/Labels.scala
index 162e4a3..e5b66f2 100644
--- a/src/main/scala/model/Labels.scala
+++ b/src/main/scala/model/Labels.scala
@@ -1,15 +1,14 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
+import model.{BaseTable => Table}
 
-object Labels extends Table[Label]("LABEL") with Functions {
-  def userName = column[String]("USER_NAME", O PrimaryKey)
-  def repositoryName = column[String]("REPOSITORY_NAME", O PrimaryKey)
-  def labelId = column[Int]("LABEL_ID", O PrimaryKey, O AutoInc)
+object Labels extends Table[Label]("LABEL") {
+  def labelId = column[Int]("LABEL_ID", O AutoInc)
   def labelName = column[String]("LABEL_NAME")
   def color = column[String]("COLOR")
-  def * = userName ~ repositoryName ~ labelId ~ labelName ~ color <> (Label, Label.unapply _)
-  def ins = userName ~ repositoryName ~ labelName ~ color
+  def * = base ~ labelId ~ labelName ~ color <> (Label, Label.unapply _)
+  def ins = base ~ labelName ~ color
 }
 
 case class Label(
diff --git a/src/main/scala/model/Milestone.scala b/src/main/scala/model/Milestone.scala
index ed492a8..048dbba 100644
--- a/src/main/scala/model/Milestone.scala
+++ b/src/main/scala/model/Milestone.scala
@@ -1,18 +1,17 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
+import model.{BaseTable => Table}
 
 object Milestones extends Table[Milestone]("MILESTONE") with Functions {
-  def userName = column[String]("USER_NAME", O PrimaryKey)
-  def repositoryName = column[String]("REPOSITORY_NAME", O PrimaryKey)
-  def milestoneId = column[Int]("MILESTONE_ID", O PrimaryKey, O AutoInc)
+  def milestoneId = column[Int]("MILESTONE_ID", O AutoInc)
   def title = column[String]("TITLE")
   def description = column[String]("DESCRIPTION")
   def dueDate = column[java.util.Date]("DUE_DATE")
   def closedDate = column[java.util.Date]("CLOSED_DATE")
-  def * = userName ~ repositoryName ~ milestoneId ~ title ~ description.? ~ dueDate.? ~ closedDate.? <> (Milestone, Milestone.unapply _)
+  def * = base ~ milestoneId ~ title ~ description.? ~ dueDate.? ~ closedDate.? <> (Milestone, Milestone.unapply _)
 
-  def autoInc = userName ~ repositoryName ~ title ~ description.? ~ dueDate.? ~ closedDate.? returning milestoneId
+  def autoInc = base ~ title ~ description.? ~ dueDate.? ~ closedDate.? returning milestoneId
 }
 
 case class Milestone(
diff --git a/src/main/scala/model/Repository.scala b/src/main/scala/model/Repository.scala
index 8c92ed4..3408ca8 100644
--- a/src/main/scala/model/Repository.scala
+++ b/src/main/scala/model/Repository.scala
@@ -1,22 +1,21 @@
 package model
 
 import scala.slick.driver.H2Driver.simple._
+import model.{BaseTable => Table}
 
 object Repositories extends Table[Repository]("REPOSITORY") with Functions {
-  def repositoryName= column[String]("REPOSITORY_NAME", O PrimaryKey)
-  def userName = column[String]("USER_NAME", O PrimaryKey)
   def isPrivate = column[Boolean]("PRIVATE")
   def description = column[String]("DESCRIPTION")
   def defaultBranch = column[String]("DEFAULT_BRANCH")
   def registeredDate = column[java.util.Date]("REGISTERED_DATE")
   def updatedDate = column[java.util.Date]("UPDATED_DATE")
   def lastActivityDate = column[java.util.Date]("LAST_ACTIVITY_DATE")
-  def * = repositoryName ~ userName ~ isPrivate ~ description.? ~ defaultBranch ~ registeredDate ~ updatedDate ~ lastActivityDate <> (Repository, Repository.unapply _)
+  def * = base ~ isPrivate ~ description.? ~ defaultBranch ~ registeredDate ~ updatedDate ~ lastActivityDate <> (Repository, Repository.unapply _)
 }
 
 case class Repository(
-  repositoryName: String,
   userName: String,
+  repositoryName: String,
   isPrivate: Boolean,
   description: Option[String],
   defaultBranch: String,
diff --git a/src/main/scala/service/RepositoryService.scala b/src/main/scala/service/RepositoryService.scala
index 57520ba..2a2a9c4 100644
--- a/src/main/scala/service/RepositoryService.scala
+++ b/src/main/scala/service/RepositoryService.scala
@@ -26,8 +26,8 @@
 
     Repositories insert
       Repository(
-        repositoryName   = repositoryName,
         userName         = userName,
+        repositoryName   = repositoryName,
         isPrivate        = false,
         description      = description,
         defaultBranch    = "master",