diff --git a/db.txt b/db.txt
new file mode 100644
index 0000000..0e49bad
--- /dev/null
+++ b/db.txt
@@ -0,0 +1,4 @@
+CREATE TABLE IF NOT EXISTS "day" ( "day" text NOT NULL PRIMARY KEY, "planned_amount_cox" integer NOT NULL DEFAULT 0, "planned_starting_time" text, "open_registration" boolean NOT NULL DEFAULT TRUE );
+CREATE TABLE IF NOT EXISTS "user" ( "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "name" text NOT NULL UNIQUE, "pw" text, "is_cox" boolean NOT NULL DEFAULT FALSE, "is_admin" boolean NOT NULL DEFAULT FALSE );
+CREATE TABLE IF NOT EXISTS "trip" ( "id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "day" text NOT NULL, "user_id" integer NOT NULL, "cox_id" integer, "begin" text, "created" text NOT NULL DEFAULT CURRENT_TIMESTAMP, FOREIGN KEY ("day") REFERENCES "day" ("day"), FOREIGN KEY ("user_id") REFERENCES "user" ("id"), FOREIGN KEY ("cox_id") REFERENCES "trip" ("id") );
+create unique index UNIQ_trip on trip("day", "user_id", IFNULL(cox_id, ''), IFNULL(begin,''));
diff --git a/src/models/trip.rs b/src/models/trip.rs
index c04afce..08cf199 100644
--- a/src/models/trip.rs
+++ b/src/models/trip.rs
@@ -6,9 +6,9 @@ use serde::{Deserialize, Serialize};
 #[derive(Clone, Debug, PartialEq, DeriveEntityModel, Eq, Serialize, Deserialize)]
 #[sea_orm(table_name = "trip")]
 pub struct Model {
-    #[sea_orm(primary_key, auto_increment = false)]
+    #[sea_orm(primary_key)]
+    pub id: i32,
     pub day: String,
-    #[sea_orm(primary_key, auto_increment = false)]
     pub user_id: i32,
     pub cox_id: Option<i32>,
     pub begin: Option<String>,
diff --git a/src/rest/restreg.rs b/src/rest/restreg.rs
index 4f628f6..9a77381 100644
--- a/src/rest/restreg.rs
+++ b/src/rest/restreg.rs
@@ -67,10 +67,7 @@ async fn register(
 
 #[derive(FromForm)]
 struct DeleteForm {
-    day: NaiveDateForm,
-    user: i32,
-    cox_id: Option<i32>,
-    begin: Option<String>,
+    id: i32,
 }
 
 #[delete("/", data = "<delete>")]
@@ -79,40 +76,31 @@ async fn delete(
     delete: Form<DeleteForm>,
     user: user::Model,
 ) -> Flash<Redirect> {
-    let day = day::Entity::find_by_id(*delete.day)
-        .one(db.inner())
-        .await
-        .unwrap()
-        .expect("There's no trip on this date (yet)");
-
-    if delete.user != user.id {
-        log::error!("{} tried to delete a registration from user_id {} on day {:?} (probably hand-crafted request)", user.name, delete.user, delete.day);
-        return Flash::error(
-            Redirect::to("/"),
-            "Du kannst nur deine eigenen Anmeldungen löschen!",
-        );
-    }
-
-    let trip = trip::Entity::find()
-        .filter(trip::Column::Day.eq(format!("{}", day.day.format("%Y-%m-%d"))))
-        .filter(trip::Column::UserId.eq(user.id))
-        .filter(trip::Column::CoxId.eq(delete.cox_id))
-        .filter(trip::Column::Begin.eq(delete.begin.clone()))
+    let trip = trip::Entity::find_by_id(delete.id)
         .one(db.inner())
         .await
         .unwrap();
+
     match trip {
         None => {
-            log::error!("Tried to register w/o being authenticated (prob. hand crafted request (user.name = {})", user.name);
+            log::error!("Tried to delete registration of non-existing trip (prob. hand crafted request (user.name = {})", user.name);
             return Flash::error(Redirect::to("/"), "Du bist gar nicht angemeldet!");
         }
         Some(trip) => {
+            if trip.user_id != user.id {
+                log::error!(
+            "{} tried to delete a registration from user_id {} (probably hand-crafted request)",
+            user.name,
+            delete.id
+        );
+                return Flash::error(
+                    Redirect::to("/"),
+                    "Du kannst nur deine eigenen Anmeldungen löschen!",
+                );
+            }
             log::info!("User {} deleted the registration for {:?}", user.name, trip);
             trip::Entity::delete(trip::ActiveModel {
-                day: Set(trip.day),
-                user_id: Set(trip.user_id),
-                //cox_id: Set(delete.cox_id),
-                begin: Set(delete.begin.clone()),
+                id: Set(trip.id),
                 ..Default::default()
             })
             .exec(db.inner())
diff --git a/templates/index.html.tera b/templates/index.html.tera
index 4a613ab..ec0af98 100644
--- a/templates/index.html.tera
+++ b/templates/index.html.tera
@@ -84,10 +84,7 @@
 		  <div style="max-width: 75%">{{ default_trips | length }} angemeldete Person{{ default_trips | length | pluralize(plural="en") }}: {{ cox | length }} Steuerperson{{ cox | length | pluralize(plural="en") }} ({% for c in cox %}{{ c.user.name }} {% if c.user.name == user.name %}
           <form method="post" action="/register">
             <input type="hidden" name="_method" value="delete" />
-            <input type="hidden" name="day" value="{{ day.day}}" />
-            <input type="hidden" name="user" value="{{ c.user.id}}" />
-            <input type="hidden" name="cox_id" value="{{ c.trip.cox_id}}" />
-            <input type="hidden" name="begin" value="{{ c.trip.begin}}" />
+            <input type="hidden" name="id" value="{{ c.trip.id }}" />
             <input type="submit" value="Abmelden" style="float: left;" />
           </form>
 		  {% endif %} {% endfor %}), {{ rowers | length }} Ruderer:</div>
@@ -99,11 +96,7 @@
           {% if r.user.name == user.name %}
           <form method="post" action="/register">
             <input type="hidden" name="_method" value="delete" />
-            <input type="hidden" name="day" value="{{ day.day}}" />
-            <input type="hidden" name="user" value="{{ r.user.id}}" />
-            <input type="hidden" name="cox_id" value="{{ r.trip.cox_id}}" />
-            <input type="hidden" name="begin" value="{{ r.trip.begin}}" />
-
+            <input type="hidden" name="id" value="{{ r.trip.id }}" />
             <input type="submit" value="Abmelden" />
             
           </form>
@@ -136,14 +129,11 @@
 	{% for trip in indep_trips %}
 		{% if trip.trip.begin %}
 			{{trip.user.name}} @ {{trip.trip.begin}}
-			{% set rowers = indep_trips | filter(attribute="trip.cox_id", value=trip.user.id) %}
+			{% set rowers = indep_trips | filter(attribute="trip.cox_id", value=trip.trip.id) %}
 			{% if trip.user.name == user.name and rowers | length == 0 %}
 				  <form method="post" action="/register">
 				    <input type="hidden" name="_method" value="delete" />
-				    <input type="hidden" name="day" value="{{ day.day}}" />
-				    <input type="hidden" name="user" value="{{ trip.user.id}}" />
-				    <input type="hidden" name="cox_id" value="{{ trip.trip.cox_id}}" />
-				    <input type="hidden" name="begin" value="{{ trip.trip.begin}}" />
+				    <input type="hidden" name="id" value="{{ trip.trip.id }}" />
 				    <input type="submit" value="Abmelden" style="float: left;" />
 				  </form>
 			{% endif %}
@@ -155,11 +145,7 @@
 					  {% if r.user.name == user.name %}
 					  <form method="post" action="/register">
 					    <input type="hidden" name="_method" value="delete" />
-					    <input type="hidden" name="day" value="{{ day.day}}" />
-					    <input type="hidden" name="user" value="{{ r.user.id}}" />
-					    <input type="hidden" name="cox_id" value="{{ trip.cox_id}}" />
-					    <input type="hidden" name="begin" value="{{ trip.begin}}" />
-
+					    <input type="hidden" name="id" value="{{ r.trip.id }}" />
 					    <input type="submit" value="Abmelden" />
 					    
 					  </form>
@@ -172,7 +158,7 @@
 			  <form method="post" class="text-left" action="/register">
 			    <input type="hidden" name="_method" value="put" />
 			    <input type="hidden" name="day" value="{{ day_string }}" />
-			    <input type="hidden" name="cox_id" value="{{ trip.user.id }}" />
+			    <input type="hidden" name="cox_id" value="{{ trip.trip.id }}" />
 			    <div class="row content-align-bottom">
 			      <div class="six columns">
 				<label for="name">Name</label>