diff --git a/src/Database.cpp b/src/Database.cpp
index 22169f31..6d57711c 100644
--- a/src/Database.cpp
+++ b/src/Database.cpp
@@ -47,6 +47,7 @@ void Database::initialize (const std::string& location)
   {
     if (1 /* TODO looks like one of our data files */)
     {
+      // Don't add the current file twice.
       if (file != _current)
       {
         Datafile oldFile;
@@ -59,6 +60,21 @@ void Database::initialize (const std::string& location)
   // TODO If there is no data file named YYYY—MM.data, then create it.
 }
 
+////////////////////////////////////////////////////////////////////////////////
+void Database::addExclusion (const std::string& exclusion)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+void Database::addInterval (const Interval& interval)
+{
+}
+
+////////////////////////////////////////////////////////////////////////////////
+void Database::modifyInterval (const Interval& interval)
+{
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 std::string Database::dump () const
 {
diff --git a/src/Database.h b/src/Database.h
index 095afa17..3e68f077 100644
--- a/src/Database.h
+++ b/src/Database.h
@@ -28,6 +28,7 @@
 #define INCLUDED_DATABASE
 
 #include <Datafile.h>
+#include <Interval.h>
 #include <vector>
 #include <string>
 
@@ -36,6 +37,11 @@ class Database
 public:
   Database () = default;
   void initialize (const std::string&);
+
+  void addExclusion (const std::string&);
+  void addInterval (const Interval&);
+  void modifyInterval (const Interval&);
+
   std::string dump () const;
 
 private: