diff --git a/crates/ascend/src/app.rs b/crates/ascend/src/app.rs
index a5a97e7..5eedc8c 100644
--- a/crates/ascend/src/app.rs
+++ b/crates/ascend/src/app.rs
@@ -43,8 +43,7 @@ pub fn App() -> impl IntoView {
             <Routes fallback=|| "Not found">
                 <Route path=path!("/") view=Home />
                 <Route path=path!("/wall/:wall_uid") view=pages::wall::Page />
-                <Route path=path!("/wall/:wall_uid/edit") view=pages::edit_wall::EditWall />
-                <Route path=path!("/wall/:wall_uid/routes") view=pages::routes::Routes />
+                <Route path=path!("/wall/:wall_uid/holds") view=pages::holds::Page />
             </Routes>
         </Router>
     }
diff --git a/crates/ascend/src/components/problem_info.rs b/crates/ascend/src/components/problem_info.rs
index 36a0638..3aeb7dc 100644
--- a/crates/ascend/src/components/problem_info.rs
+++ b/crates/ascend/src/components/problem_info.rs
@@ -6,15 +6,15 @@ use leptos::prelude::*;
 pub fn ProblemInfo(#[prop(into)] problem: Signal<models::Problem>) -> impl IntoView {
     tracing::trace!("Enter problem info");
 
-    let name = Signal::derive(move || problem.read().name.clone());
-    let set_by = Signal::derive(move || problem.read().set_by.clone());
     let method = Signal::derive(move || problem.read().method.to_string());
+    // let name = Signal::derive(move || problem.read().name.clone());
+    // let set_by = Signal::derive(move || problem.read().set_by.clone());
 
     view! {
         <div class="grid grid-rows-none gap-y-1 gap-x-0.5 grid-cols-[auto_1fr]">
-            <NameValue name="Name:" value=name />
             <NameValue name="Method:" value=method />
-            <NameValue name="Set By:" value=set_by />
+        // <NameValue name="Name:" value=name />
+        // <NameValue name="Set By:" value=set_by />
         </div>
     }
 }
diff --git a/crates/ascend/src/models.rs b/crates/ascend/src/models.rs
index d3ee4ee..6189ce5 100644
--- a/crates/ascend/src/models.rs
+++ b/crates/ascend/src/models.rs
@@ -8,17 +8,16 @@ pub use v2::ImageFilename;
 pub use v2::ImageResolution;
 pub use v2::ImageUid;
 pub use v2::Method;
-pub use v2::ProblemUid;
 pub use v2::Root;
-pub use v2::Wall;
 pub use v2::WallDimensions;
 pub use v2::WallUid;
 pub use v3::Attempt;
-pub use v3::UserInteraction;
 pub use v4::DatedAttempt;
+pub use v4::Pattern;
 pub use v4::Problem;
-pub use v4::ProblemHolds;
 pub use v4::Transformation;
+pub use v4::UserInteraction;
+pub use v4::Wall;
 
 mod semantics;
 
@@ -28,6 +27,8 @@ pub mod v4 {
     use super::v3;
     use chrono::DateTime;
     use chrono::Utc;
+    use derive_more::Display;
+    use derive_more::FromStr;
     use serde::Deserialize;
     use serde::Serialize;
     use std::collections::BTreeMap;
@@ -38,24 +39,39 @@ pub mod v4 {
         pub uid: v2::WallUid,
         pub wall_dimensions: v2::WallDimensions,
         pub holds: BTreeMap<v1::HoldPosition, v2::Hold>,
+
+        /// Canonicalized.
         pub problems: BTreeSet<Problem>,
     }
 
     #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
     pub struct Problem {
-        pub holds: ProblemHolds,
+        pub pattern: Pattern,
         pub method: v2::Method,
-        pub transformation: Transformation,
+    }
+
+    #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
+    pub struct Pattern {
+        pub pattern: BTreeMap<v1::HoldPosition, v1::HoldRole>,
     }
 
     #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Copy, Default)]
     pub struct Transformation {
-        pub horizontal_shift: u64,
+        pub shift_right: u64,
         pub mirror: bool,
     }
 
-    #[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
-    pub struct ProblemHolds(pub BTreeMap<v1::HoldPosition, v1::HoldRole>);
+    #[derive(Serialize, Deserialize, Debug, Clone)]
+    pub struct UserInteraction {
+        pub wall_uid: v2::WallUid,
+        pub problem: Problem,
+
+        /// Dates on which this problem was attempted, and how it went
+        pub attempted_on: BTreeMap<chrono::DateTime<chrono::Utc>, v3::Attempt>,
+
+        /// Is among favorite problems
+        pub is_favorite: bool,
+    }
 
     #[derive(Debug, Clone, Copy)]
     pub struct DatedAttempt {
@@ -117,7 +133,6 @@ pub mod v2 {
     pub struct Wall {
         pub uid: WallUid,
 
-        // TODO: Replace by walldimensions
         pub rows: u64,
         pub cols: u64,
 
@@ -152,11 +167,11 @@ pub mod v2 {
         #[display("Feet follow hands")]
         FeetFollowHands,
 
-        #[display("Footless")]
-        Footless,
-
         #[display("Footless plus kickboard")]
         FootlessPlusKickboard,
+
+        #[display("Footless")]
+        Footless,
     }
 
     #[derive(Serialize, Deserialize, Clone, Debug)]
diff --git a/crates/ascend/src/models/semantics.rs b/crates/ascend/src/models/semantics.rs
index 8989489..9c91cb1 100644
--- a/crates/ascend/src/models/semantics.rs
+++ b/crates/ascend/src/models/semantics.rs
@@ -3,87 +3,73 @@ use chrono::DateTime;
 use chrono::Utc;
 use std::collections::BTreeMap;
 
-impl Problem {
-    pub fn normalize(&self) -> Self {
-        let Self {
-            holds,
-            method,
-            transformation,
-        } = self;
-
-        let mut transformation = *transformation;
-
-        let min_col = holds.0.iter().map(|(hold_position, _)| hold_position.col).min().unwrap_or(0);
-        transformation.horizontal_shift += min_col;
-        let holds = {
-            let holds = holds
-                .0
-                .iter()
-                .map(|(hold_position, hold_role)| {
-                    let hold_position = HoldPosition {
-                        row: hold_position.row,
-                        col: hold_position.col - min_col,
-                    };
-                    (hold_position, *hold_role)
-                })
-                .collect();
-            ProblemHolds(holds)
-        };
-
-        let mut new = Self {
-            holds,
-            method: *method,
-            transformation,
-        };
-
-        if new.transformation.mirror {
-            new = new.mirror();
-        }
-
-        new
+impl Pattern {
+    #[must_use]
+    pub fn canonicalize(&self) -> Self {
+        let mut pattern = self.clone();
+        let min_col = pattern.pattern.iter().map(|(hold_position, _)| hold_position.col).min().unwrap_or(0);
+        pattern.pattern = pattern
+            .pattern
+            .iter()
+            .map(|(hold_position, hold_role)| {
+                let hold_position = HoldPosition {
+                    row: hold_position.row,
+                    col: hold_position.col - min_col,
+                };
+                (hold_position, *hold_role)
+            })
+            .collect();
+        std::cmp::min(pattern.mirror(), pattern)
     }
 
+    #[must_use]
+    pub fn apply_transformation(&self, transformation: Transformation) -> Self {
+        let mut holds = self.clone();
+        if transformation.shift_right > 0 {
+            holds = holds.shift_right(transformation.shift_right);
+        }
+        if transformation.mirror {
+            holds = holds.mirror();
+        }
+        holds
+    }
+
+    #[must_use]
+    pub fn shift_right(&self, shift: u64) -> Self {
+        let mut pattern = self.clone();
+        pattern.pattern = pattern
+            .pattern
+            .iter()
+            .map(|(hold_position, hold_role)| {
+                let mut hold_position = hold_position.clone();
+                hold_position.col += shift;
+                (hold_position, *hold_role)
+            })
+            .collect();
+        pattern
+    }
+
+    #[must_use]
     pub fn mirror(&self) -> Self {
-        let Self {
-            holds,
-            method,
-            transformation,
-        } = self;
+        let mut pattern = self.clone();
 
-        let min_col = holds.0.iter().map(|(hold_position, _)| hold_position.col).min().unwrap_or(0);
-        let max_col = holds.0.iter().map(|(hold_position, _)| hold_position.col).max().unwrap_or(0);
+        let min_col = pattern.pattern.iter().map(|(hold_position, _)| hold_position.col).min().unwrap_or(0);
+        let max_col = pattern.pattern.iter().map(|(hold_position, _)| hold_position.col).max().unwrap_or(0);
 
-        let holds = {
-            let holds = holds
-                .0
-                .iter()
-                .map(|(hold_position, hold_role)| {
-                    let HoldPosition { row, col } = *hold_position;
-                    let mut mirrored_col = col;
-                    mirrored_col += 2 * (max_col - col);
-                    mirrored_col -= max_col - min_col;
-                    let hold_position = HoldPosition { row, col: mirrored_col };
-                    (hold_position, *hold_role)
-                })
-                .collect();
-            ProblemHolds(holds)
-        };
+        pattern.pattern = pattern
+            .pattern
+            .iter()
+            .map(|(hold_position, hold_role)| {
+                let HoldPosition { row, col } = *hold_position;
+                let mut mirrored_col = col;
+                mirrored_col += 2 * (max_col - col);
+                mirrored_col -= max_col - min_col;
+                let hold_position = HoldPosition { row, col: mirrored_col };
+                (hold_position, *hold_role)
+            })
+            .collect();
 
-        let transformation = {
-            let mut transformation = *transformation;
-            transformation.mirror = !transformation.mirror;
-            transformation
-        };
-
-        Self {
-            holds,
-            method: *method,
-            transformation,
-        }
-    }
-
-    pub fn shift(&self, shift: i64) -> Self {
-        todo!()
+        pattern
     }
 }
 
@@ -147,12 +133,6 @@ impl WallUid {
     pub(crate) fn create() -> Self {
         Self(uuid::Uuid::new_v4())
     }
-}
-
-impl ProblemUid {
-    pub(crate) fn create() -> Self {
-        Self(uuid::Uuid::new_v4())
-    }
     pub(crate) fn min() -> Self {
         Self(uuid::Uuid::nil())
     }
@@ -188,66 +168,68 @@ impl Attempt {
     }
 }
 
+impl std::str::FromStr for Problem {
+    type Err = ron::Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let problem = ron::from_str(s)?;
+        Ok(problem)
+    }
+}
+
+impl std::fmt::Display for Problem {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let s = ron::to_string(self).unwrap();
+        write!(f, "{s}")?;
+        Ok(())
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test_try::test_try]
-    fn normalize_empty_problem() {
-        let problem = Problem {
-            holds: ProblemHolds([].into_iter().collect()),
-            method: Method::FeetFollowHands,
-            transformation: Transformation::default(),
+    fn canonicalize_empty_pattern() {
+        let pattern = Pattern {
+            pattern: [].into_iter().collect(),
         };
-        let normalized = problem.normalize();
-        assert_eq!(problem, normalized);
-        let mirrored = problem.mirror();
-        assert_eq!(problem, mirrored);
+        let canonicalized = pattern.canonicalize();
+        assert_eq!(pattern, canonicalized);
+        let mirrored = pattern.mirror();
+        assert_eq!(pattern, mirrored);
     }
 
     #[test_try::test_try]
-    fn normalize_problem() {
-        let problem = Problem {
-            holds: ProblemHolds(
-                [
-                    (HoldPosition { row: 0, col: 1 }, HoldRole::End),
-                    (HoldPosition { row: 7, col: 6 }, HoldRole::Start),
-                ]
-                .into_iter()
-                .collect(),
-            ),
-            method: Method::FeetFollowHands,
-            transformation: Transformation::default(),
+    fn canonicalize_pattern() {
+        let pattern = Pattern {
+            pattern: [
+                (HoldPosition { row: 0, col: 1 }, HoldRole::End),
+                (HoldPosition { row: 7, col: 6 }, HoldRole::Start),
+            ]
+            .into_iter()
+            .collect(),
         };
 
-        let normalized = problem.normalize();
+        let canonicalized = pattern.canonicalize();
 
-        assert_eq!(normalized.holds.0[&HoldPosition { row: 0, col: 0 }], HoldRole::End);
-        assert_eq!(normalized.holds.0[&HoldPosition { row: 7, col: 5 }], HoldRole::Start);
-        assert_eq!(normalized.transformation.horizontal_shift, 1);
-        assert_eq!(normalized.transformation.mirror, false);
+        assert_eq!(canonicalized.pattern[&HoldPosition { row: 0, col: 0 }], HoldRole::End);
+        assert_eq!(canonicalized.pattern[&HoldPosition { row: 7, col: 5 }], HoldRole::Start);
     }
 
     #[test_try::test_try]
-    fn mirror_problem() {
-        let problem = Problem {
-            holds: ProblemHolds(
-                [
-                    (HoldPosition { row: 0, col: 1 }, HoldRole::End),
-                    (HoldPosition { row: 7, col: 6 }, HoldRole::Start),
-                ]
-                .into_iter()
-                .collect(),
-            ),
-            method: Method::FeetFollowHands,
-            transformation: Transformation::default(),
+    fn mirror_pattern() {
+        let pattern = Pattern {
+            pattern: [
+                (HoldPosition { row: 0, col: 1 }, HoldRole::End),
+                (HoldPosition { row: 7, col: 6 }, HoldRole::Start),
+            ]
+            .into_iter()
+            .collect(),
         };
 
-        let normalized = problem.normalize();
+        let mirrored = pattern.mirror();
 
-        assert_eq!(normalized.holds.0[&HoldPosition { row: 0, col: 0 }], HoldRole::End);
-        assert_eq!(normalized.holds.0[&HoldPosition { row: 7, col: 5 }], HoldRole::Start);
-        assert_eq!(normalized.transformation.horizontal_shift, 1);
-        assert_eq!(normalized.transformation.mirror, false);
+        assert_eq!(mirrored.pattern[&HoldPosition { row: 0, col: 6 }], HoldRole::End);
+        assert_eq!(mirrored.pattern[&HoldPosition { row: 7, col: 1 }], HoldRole::Start);
     }
 }
diff --git a/crates/ascend/src/pages.rs b/crates/ascend/src/pages.rs
index 40fe8dd..c392232 100644
--- a/crates/ascend/src/pages.rs
+++ b/crates/ascend/src/pages.rs
@@ -1,4 +1,3 @@
-pub mod edit_wall;
-pub mod routes;
+pub mod holds;
 pub mod settings;
 pub mod wall;
diff --git a/crates/ascend/src/pages/edit_wall.rs b/crates/ascend/src/pages/holds.rs
similarity index 97%
rename from crates/ascend/src/pages/edit_wall.rs
rename to crates/ascend/src/pages/holds.rs
index e8b6167..71aa6a3 100644
--- a/crates/ascend/src/pages/edit_wall.rs
+++ b/crates/ascend/src/pages/holds.rs
@@ -24,7 +24,7 @@ struct RouteParams {
 }
 
 #[component]
-pub fn EditWall() -> impl IntoView {
+pub fn Page() -> impl IntoView {
     let params = leptos_router::hooks::use_params::<RouteParams>();
     let wall_uid = Signal::derive(move || {
         params
@@ -85,8 +85,8 @@ fn Ready(wall: models::Wall) -> impl IntoView {
     }
 
     let style = {
-        let grid_rows = crate::css::grid_rows_n(wall.rows);
-        let grid_cols = crate::css::grid_cols_n(wall.cols);
+        let grid_rows = crate::css::grid_rows_n(wall.wall_dimensions.rows);
+        let grid_cols = crate::css::grid_cols_n(wall.wall_dimensions.cols);
         [grid_rows, grid_cols].join(" ")
     };
 
diff --git a/crates/ascend/src/pages/routes.rs b/crates/ascend/src/pages/routes.rs
deleted file mode 100644
index d8244e3..0000000
--- a/crates/ascend/src/pages/routes.rs
+++ /dev/null
@@ -1,102 +0,0 @@
-use crate::components;
-use crate::components::header::HeaderItem;
-use crate::components::header::HeaderItems;
-use crate::components::header::StyledHeader;
-use crate::models;
-use leptos::Params;
-use leptos::prelude::*;
-use leptos_router::params::Params;
-
-#[derive(Params, PartialEq, Clone)]
-struct RouteParams {
-    // Is never None
-    wall_uid: Option<models::WallUid>,
-}
-
-#[component]
-#[tracing::instrument(skip_all)]
-pub fn Routes() -> impl IntoView {
-    tracing::debug!("Enter");
-
-    let params = leptos_router::hooks::use_params::<RouteParams>();
-    let wall_uid = Signal::derive(move || {
-        params
-            .get()
-            .expect("gets wall_uid from URL")
-            .wall_uid
-            .expect("wall_uid param is never None")
-    });
-
-    let wall = crate::resources::wall_by_uid(wall_uid);
-    let problems = crate::resources::problems_for_wall(wall_uid);
-
-    let header_items = move || HeaderItems {
-        left: vec![HeaderItem {
-            text: "← Ascend".to_string(),
-            link: Some(format!("/wall/{}", wall_uid.get())),
-        }],
-        middle: vec![HeaderItem {
-            text: "Routes".to_string(),
-            link: None,
-        }],
-        right: vec![],
-    };
-
-    let suspend = move || {
-        Suspend::new(async move {
-            let wall = wall.await;
-            let problems = problems.await;
-
-            let v = move || -> Result<_, ServerFnError> {
-                let wall = wall.clone()?;
-                let problems = problems.clone()?;
-
-                let wall_dimensions = models::WallDimensions {
-                    rows: wall.rows,
-                    cols: wall.cols,
-                };
-                let problems_sample = move || problems.values().take(10).cloned().collect::<Vec<_>>();
-
-                Ok(view! {
-                    <div>
-                        <For
-                            each=problems_sample
-                            key=|problem| problem.uid
-                            children=move |problem: models::Problem| {
-                                view! {
-                                    <Problem dim=wall_dimensions problem />
-                                    <hr class="my-8 h-px bg-gray-700 border-0" />
-                                }
-                            }
-                        />
-                    </div>
-                })
-            };
-
-            view! { <ErrorBoundary fallback=|_errors| "error">{v}</ErrorBoundary> }
-        })
-    };
-
-    view! {
-        <div class="min-h-screen min-w-screen bg-neutral-950">
-            <StyledHeader items=Signal::derive(header_items) />
-
-            <div class="container mx-auto mt-6">
-                <Suspense fallback=|| view! { <p>"loading"</p> }>{suspend}</Suspense>
-            </div>
-        </div>
-    }
-}
-
-#[component]
-#[tracing::instrument(skip_all)]
-fn Problem(#[prop(into)] dim: Signal<models::WallDimensions>, #[prop(into)] problem: Signal<models::Problem>) -> impl IntoView {
-    view! {
-        <div class="flex items-start">
-            <div class="flex-none">
-                <components::Problem dim problem />
-            </div>
-            <components::ProblemInfo problem=problem.get() />
-        </div>
-    }
-}
diff --git a/crates/ascend/src/pages/wall.rs b/crates/ascend/src/pages/wall.rs
index b22fbc3..29c68c0 100644
--- a/crates/ascend/src/pages/wall.rs
+++ b/crates/ascend/src/pages/wall.rs
@@ -35,7 +35,6 @@ pub fn Page() -> impl IntoView {
     });
 
     let wall = crate::resources::wall_by_uid(wall_uid);
-    let problems = crate::resources::problems_for_wall(wall_uid);
     let user_interactions = crate::resources::user_interactions(wall_uid);
 
     leptos::view! {
@@ -46,10 +45,9 @@ pub fn Page() -> impl IntoView {
                 {move || Suspend::new(async move {
                     tracing::debug!("executing main suspend");
                     let wall = wall.await?;
-                    let problems = problems.await?;
                     let user_interactions = user_interactions.await?;
                     let user_interactions = RwSignal::new(user_interactions);
-                    Ok::<_, ServerFnError>(view! { <Controller wall problems user_interactions /> })
+                    Ok::<_, ServerFnError>(view! { <Controller wall user_interactions /> })
                 })}
             </Suspense>
         </div>
@@ -59,9 +57,9 @@ pub fn Page() -> impl IntoView {
 #[derive(Debug, Clone, Copy)]
 struct Context {
     wall: Signal<models::Wall>,
-    user_interactions: Signal<BTreeMap<models::ProblemUid, models::UserInteraction>>,
+    user_interactions: Signal<BTreeMap<models::Problem, models::UserInteraction>>,
     problem: Signal<Option<models::Problem>>,
-    filtered_problems: Signal<BTreeMap<models::ProblemUid, models::Problem>>,
+    filtered_problems: Signal<BTreeSet<models::Problem>>,
     user_interaction: Signal<Option<models::UserInteraction>>,
     todays_attempt: Signal<Option<models::Attempt>>,
     latest_attempt: Signal<Option<models::DatedAttempt>>,
@@ -76,13 +74,12 @@ struct Context {
 #[tracing::instrument(skip_all)]
 fn Controller(
     #[prop(into)] wall: Signal<models::Wall>,
-    #[prop(into)] problems: Signal<BTreeMap<models::ProblemUid, models::Problem>>,
-    #[prop(into)] user_interactions: RwSignal<BTreeMap<models::ProblemUid, models::UserInteraction>>,
+    #[prop(into)] user_interactions: RwSignal<BTreeMap<models::Problem, models::UserInteraction>>,
 ) -> impl IntoView {
     crate::tracing::on_enter!();
 
     // Extract data from URL
-    let (problem_uid, set_problem_uid) = leptos_router::hooks::query_signal::<models::ProblemUid>("problem");
+    let (problem_url, set_problem_url) = leptos_router::hooks::query_signal::<models::Problem>("problem");
 
     // Filter
     let (filter_holds, set_filter_holds) = signal(BTreeSet::new());
@@ -94,8 +91,8 @@ fn Controller(
 
     // Derive signals
     let wall_uid = signals::wall_uid(wall);
-    let problem = signals::problem(problems, problem_uid.into());
-    let user_interaction = signals::user_interaction(user_interactions.into(), problem_uid.into());
+    let problems = signals::problems(wall);
+    let user_interaction = signals::user_interaction(user_interactions.into(), problem_url.into());
     let filtered_problems = signals::filtered_problems(problems, filter_holds.into());
     let todays_attempt = signals::todays_attempt(user_interaction);
     let latest_attempt = signals::latest_attempt(user_interaction);
@@ -116,7 +113,7 @@ fn Controller(
         let mut rng = rand::rng();
         let problem_uid = population.choose(&mut rng);
 
-        set_problem_uid.set(problem_uid);
+        set_problem_url.set(problem_uid);
     });
 
     // Callback: On click hold, Add/Remove hold position to problem filter
@@ -130,7 +127,7 @@ fn Controller(
 
     // Set a problem when wall is set (loaded)
     Effect::new(move |_prev_value| {
-        if problem_uid.get().is_none() {
+        if problem_url.get().is_none() {
             tracing::debug!("Setting initial problem");
             cb_set_random_problem.run(());
         }
@@ -370,7 +367,7 @@ fn AttemptRadioGroup() -> impl IntoView {
 
     let ctx = use_context::<Context>().unwrap();
 
-    let problem_uid = Signal::derive(move || ctx.problem.read().as_ref().map(|p| p.uid));
+    let problem = ctx.problem;
 
     let mut attempt_radio_buttons = vec![];
     for variant in [models::Attempt::Flash, models::Attempt::Send, models::Attempt::Attempt] {
@@ -379,10 +376,10 @@ fn AttemptRadioGroup() -> impl IntoView {
         let onclick = move |_| {
             let attempt = if ui_toggle.get() { None } else { Some(variant) };
 
-            if let Some(problem_uid) = problem_uid.get() {
+            if let Some(problem) = problem.get() {
                 ctx.cb_upsert_todays_attempt.run(server_functions::UpsertTodaysAttempt {
                     wall_uid: ctx.wall.read().uid,
-                    problem_uid,
+                    problem,
                     attempt,
                 });
             }
@@ -469,9 +466,9 @@ fn Wall() -> impl IntoView {
         }
 
         let style = {
-            let grid_rows = crate::css::grid_rows_n(wall.rows);
-            let grid_cols = crate::css::grid_cols_n(wall.cols);
-            let max_width = format!("{}vh", wall.cols as f64 / wall.rows as f64 * 100.);
+            let grid_rows = crate::css::grid_rows_n(wall.wall_dimensions.rows);
+            let grid_cols = crate::css::grid_cols_n(wall.wall_dimensions.cols);
+            let max_width = format!("{}vh", wall.wall_dimensions.cols as f64 / wall.wall_dimensions.rows as f64 * 100.);
             format!("max-height: 100vh; max-width: {max_width}; {}", [grid_rows, grid_cols].join(" "))
         };
 
@@ -568,27 +565,16 @@ mod signals {
         })
     }
 
-    pub(crate) fn problem(
-        problems: Signal<BTreeMap<models::ProblemUid, models::Problem>>,
-        problem_uid: Signal<Option<models::ProblemUid>>,
-    ) -> Signal<Option<models::Problem>> {
-        Signal::derive(move || {
-            let problem_uid = problem_uid.get()?;
-            let problems = problems.read();
-            problems.get(&problem_uid).cloned()
-        })
-    }
-
     pub(crate) fn filtered_problems(
-        problems: Signal<BTreeMap<models::ProblemUid, models::Problem>>,
+        wall: Signal<models::Wall>,
         filter_holds: Signal<BTreeSet<models::HoldPosition>>,
-    ) -> Memo<BTreeMap<models::ProblemUid, models::Problem>> {
+    ) -> Memo<BTreeSet<models::Problem>> {
         Memo::new(move |_prev_val| {
             let filter_holds = filter_holds.read();
-            problems.with(|problems| {
-                problems
+            wall.with(|wall| {
+                wall.problems
                     .iter()
-                    .filter(|(_, problem)| filter_holds.iter().all(|hold_pos| problem.holds.contains_key(hold_pos)))
+                    .filter(|(_, problem)| filter_holds.iter().all(|hold_pos| problem.pattern.pattern.contains_key(hold_pos)))
                     .map(|(problem_uid, problem)| (*problem_uid, problem.clone()))
                     .collect::<BTreeMap<models::ProblemUid, models::Problem>>()
             })
@@ -596,6 +582,6 @@ mod signals {
     }
 
     pub(crate) fn hold_role(problem: Signal<Option<models::Problem>>, hold_position: models::HoldPosition) -> Signal<Option<models::HoldRole>> {
-        Signal::derive(move || problem.get().and_then(|p| p.holds.get(&hold_position).copied()))
+        Signal::derive(move || problem.get().and_then(|p| p.pattern.pattern.get(&hold_position).copied()))
     }
 }
diff --git a/crates/ascend/src/resources.rs b/crates/ascend/src/resources.rs
index d60c491..e5d8222 100644
--- a/crates/ascend/src/resources.rs
+++ b/crates/ascend/src/resources.rs
@@ -17,47 +17,15 @@ pub fn wall_by_uid(wall_uid: Signal<models::WallUid>) -> RonResource<models::Wal
     )
 }
 
-/// Version of [problem_by_uid] that short circuits if the input problem_uid signal is None.
-pub fn problem_by_uid_optional(
-    wall_uid: Signal<models::WallUid>,
-    problem_uid: Signal<Option<models::ProblemUid>>,
-) -> RonResource<Option<models::Problem>> {
-    Resource::new_with_options(
-        move || (wall_uid.get(), problem_uid.get()),
-        move |(wall_uid, problem_uid)| async move {
-            let Some(problem_uid) = problem_uid else {
-                return Ok(None);
-            };
-            crate::server_functions::get_problem_by_uid(wall_uid, problem_uid)
-                .await
-                .map(RonEncoded::into_inner)
-                .map(Some)
-        },
-        false,
-    )
-}
-
-/// Returns all problems for a wall
-pub fn problems_for_wall(wall_uid: Signal<models::WallUid>) -> RonResource<BTreeMap<models::ProblemUid, models::Problem>> {
-    Resource::new_with_options(
-        move || wall_uid.get(),
-        move |wall_uid| async move { crate::server_functions::get_problems_for_wall(wall_uid).await.map(RonEncoded::into_inner) },
-        false,
-    )
-}
-
 /// Returns user interaction for a single problem
-pub fn user_interaction(
-    wall_uid: Signal<models::WallUid>,
-    problem_uid: Signal<Option<models::ProblemUid>>,
-) -> RonResource<Option<models::UserInteraction>> {
+pub fn user_interaction(wall_uid: Signal<models::WallUid>, problem: Signal<Option<models::Problem>>) -> RonResource<Option<models::UserInteraction>> {
     Resource::new_with_options(
-        move || (wall_uid.get(), problem_uid.get()),
-        move |(wall_uid, problem_uid)| async move {
-            let Some(problem_uid) = problem_uid else {
+        move || (wall_uid.get(), problem.get()),
+        move |(wall_uid, problem)| async move {
+            let Some(problem) = problem else {
                 return Ok(None);
             };
-            crate::server_functions::get_user_interaction(wall_uid, problem_uid)
+            crate::server_functions::get_user_interaction(wall_uid, problem)
                 .await
                 .map(RonEncoded::into_inner)
         },
diff --git a/crates/ascend/src/server/db.rs b/crates/ascend/src/server/db.rs
index a3da7c0..b628b80 100644
--- a/crates/ascend/src/server/db.rs
+++ b/crates/ascend/src/server/db.rs
@@ -121,13 +121,6 @@ pub async fn init_at_current_version(db: &Database) -> Result<(), DatabaseOperat
                 assert!(table.is_empty()?);
             }
 
-            // Problems table
-            {
-                // Opening the table creates the table
-                let table = txn.open_table(current::TABLE_PROBLEMS)?;
-                assert!(table.is_empty()?);
-            }
-
             // User table
             {
                 // Opening the table creates the table
@@ -147,11 +140,11 @@ use crate::models;
 pub mod current {
     use super::v2;
     use super::v3;
-    pub use v2::TABLE_PROBLEMS;
+    use super::v4;
     pub use v2::TABLE_ROOT;
-    pub use v2::TABLE_WALLS;
-    pub use v3::TABLE_USER;
     pub use v3::VERSION;
+    pub use v4::TABLE_USER;
+    pub use v4::TABLE_WALLS;
 }
 
 pub mod v4 {
@@ -161,7 +154,9 @@ pub mod v4 {
 
     pub const VERSION: u64 = 4;
 
-    // TODO
+    pub const TABLE_WALLS: TableDefinition<Bincode<models::v2::WallUid>, Bincode<models::v4::Wall>> = TableDefinition::new("walls");
+    pub const TABLE_USER: TableDefinition<Bincode<(models::v2::WallUid, models::v4::Problem)>, Bincode<models::v4::UserInteraction>> =
+        TableDefinition::new("user");
 }
 
 pub mod v3 {
diff --git a/crates/ascend/src/server/migrations.rs b/crates/ascend/src/server/migrations.rs
index a3f7df1..3b20e6b 100644
--- a/crates/ascend/src/server/migrations.rs
+++ b/crates/ascend/src/server/migrations.rs
@@ -9,6 +9,25 @@ pub async fn run_migrations(db: &Database) -> Result<(), Box<dyn std::error::Err
     if is_at_version(db, 2).await? {
         migrate_to_v3(db).await?;
     }
+    if is_at_version(db, 3).await? {
+        migrate_to_v4(db).await?;
+    }
+
+    Ok(())
+}
+
+/// migrate: walls table
+/// migrate: user table
+/// remove: problems table
+#[tracing::instrument(skip_all, err)]
+pub async fn migrate_to_v4(db: &Database) -> Result<(), Box<dyn std::error::Error>> {
+    use redb::ReadableTableMetadata;
+    tracing::warn!("MIGRATING TO VERSION 4");
+
+    todo!();
+    db.write(|txn| Ok(())).await?;
+
+    db.set_version(db::Version { version: db::v4::VERSION }).await?;
 
     Ok(())
 }
diff --git a/crates/ascend/src/server/operations.rs b/crates/ascend/src/server/operations.rs
index 13e294b..5b4e569 100644
--- a/crates/ascend/src/server/operations.rs
+++ b/crates/ascend/src/server/operations.rs
@@ -20,11 +20,9 @@ pub(crate) async fn import_mini_moonboard_problems(config: &Config, db: Database
 
     tracing::info!("Parsing mini moonboard problems from {file_path}");
 
-    let set_by = "mini-mb-2020-parser";
-
     let mini_moonboard = mini_moonboard::parse(file_path.as_std_path()).await?;
     for mini_mb_problem in mini_moonboard.problems {
-        let mut holds = BTreeMap::<HoldPosition, HoldRole>::new();
+        let mut pattern = BTreeMap::<HoldPosition, HoldRole>::new();
         for mv in mini_mb_problem.moves {
             let row = mv.description.row();
             let col = mv.description.column();
@@ -36,43 +34,29 @@ pub(crate) async fn import_mini_moonboard_problems(config: &Config, db: Database
                 (false, true) => HoldRole::End,
                 (false, false) => HoldRole::Normal,
             };
-            holds.insert(hold_position, role);
+            pattern.insert(hold_position, role);
         }
 
-        let name = mini_mb_problem.name;
-
         let method = match mini_mb_problem.method {
             mini_moonboard::Method::FeetFollowHands => models::Method::FeetFollowHands,
             mini_moonboard::Method::Footless => models::Method::Footless,
             mini_moonboard::Method::FootlessPlusKickboard => models::Method::FootlessPlusKickboard,
         };
 
-        let problem_id = models::ProblemUid::create();
-
         let problem = models::Problem {
-            uid: problem_id,
-            name,
-            set_by: set_by.to_owned(),
-            holds,
+            pattern: models::Pattern { pattern },
             method,
-            date_added: chrono::Utc::now(),
         };
         problems.push(problem);
     }
 
     db.write(|txn| {
         let mut walls_table = txn.open_table(db::current::TABLE_WALLS)?;
-        let mut problems_table = txn.open_table(db::current::TABLE_PROBLEMS)?;
 
         let mut wall = walls_table.get(wall_uid)?.unwrap().value();
-        wall.problems.extend(problems.iter().map(|p| p.uid));
+        wall.problems.extend(problems);
         walls_table.insert(wall_uid, wall)?;
 
-        for problem in problems {
-            let key = (wall_uid, problem.uid);
-            problems_table.insert(key, problem)?;
-        }
-
         Ok(())
     })
     .await?;
diff --git a/crates/ascend/src/server_functions.rs b/crates/ascend/src/server_functions.rs
index 7a58cc0..632ac56 100644
--- a/crates/ascend/src/server_functions.rs
+++ b/crates/ascend/src/server_functions.rs
@@ -71,68 +71,6 @@ pub(crate) async fn get_wall_by_uid(wall_uid: models::WallUid) -> Result<RonEnco
     Ok(RonEncoded::new(wall))
 }
 
-#[server(
-    input = Ron,
-    output = Ron,
-    custom = RonEncoded
-)]
-#[tracing::instrument(err(Debug))]
-pub(crate) async fn get_problems_for_wall(
-    wall_uid: models::WallUid,
-) -> Result<RonEncoded<BTreeMap<models::ProblemUid, models::Problem>>, ServerFnError> {
-    use crate::server::db::Database;
-    use crate::server::db::DatabaseOperationError;
-    use leptos::prelude::expect_context;
-    tracing::trace!("Enter");
-
-    #[derive(Debug, derive_more::Error, derive_more::Display, derive_more::From)]
-    enum Error {
-        #[display("Wall not found: {_0:?}")]
-        WallNotFound(#[error(not(source))] models::WallUid),
-
-        DatabaseOperation(DatabaseOperationError),
-    }
-
-    async fn inner(wall_uid: models::WallUid) -> Result<BTreeMap<models::ProblemUid, models::Problem>, Error> {
-        let db = expect_context::<Database>();
-
-        let problems = db
-            .read(|txn| {
-                let walls_table = txn.open_table(crate::server::db::current::TABLE_WALLS)?;
-                tracing::debug!("getting wall");
-                let wall = walls_table
-                    .get(wall_uid)?
-                    .ok_or(Error::WallNotFound(wall_uid))
-                    .map_err(DatabaseOperationError::custom)?
-                    .value();
-                tracing::debug!("got wall");
-                drop(walls_table);
-
-                tracing::debug!("open problems table");
-                let problems_table = txn.open_table(crate::server::db::current::TABLE_PROBLEMS)?;
-                tracing::debug!("opened problems table");
-
-                let problems = wall
-                    .problems
-                    .iter()
-                    .map(|problem_uid| problems_table.get(&(wall_uid, *problem_uid)))
-                    .filter_map(|res| res.transpose())
-                    .map_res(|guard| guard.value())
-                    .map_res(|problem| (problem.uid, problem))
-                    .collect::<Result<BTreeMap<models::ProblemUid, models::Problem>, _>>()?;
-
-                Ok(problems)
-            })
-            .await?;
-
-        Ok(problems)
-    }
-
-    let problems = inner(wall_uid).await.map_err(error_reporter::Report::new).map_err(ServerFnError::new)?;
-
-    Ok(RonEncoded::new(problems))
-}
-
 /// Returns user interaction for a single wall problem
 #[server(
     input = Ron,
@@ -142,7 +80,7 @@ pub(crate) async fn get_problems_for_wall(
 #[tracing::instrument(err(Debug))]
 pub(crate) async fn get_user_interaction(
     wall_uid: models::WallUid,
-    problem_uid: models::ProblemUid,
+    problem: models::Problem,
 ) -> Result<RonEncoded<Option<models::UserInteraction>>, ServerFnError> {
     use crate::server::db::Database;
     use crate::server::db::DatabaseOperationError;
@@ -157,13 +95,13 @@ pub(crate) async fn get_user_interaction(
         DatabaseOperation(DatabaseOperationError),
     }
 
-    async fn inner(wall_uid: models::WallUid, problem_uid: models::ProblemUid) -> Result<Option<UserInteraction>, Error> {
+    async fn inner(wall_uid: models::WallUid, problem: models::Problem) -> Result<Option<UserInteraction>, Error> {
         let db = expect_context::<Database>();
 
         let user_interaction = db
             .read(|txn| {
                 let user_table = txn.open_table(crate::server::db::current::TABLE_USER)?;
-                let user_interaction = user_table.get((wall_uid, problem_uid))?.map(|guard| guard.value());
+                let user_interaction = user_table.get(&(wall_uid, problem))?.map(|guard| guard.value());
                 Ok(user_interaction)
             })
             .await?;
@@ -171,7 +109,7 @@ pub(crate) async fn get_user_interaction(
         Ok(user_interaction)
     }
 
-    let user_interaction = inner(wall_uid, problem_uid)
+    let user_interaction = inner(wall_uid, problem)
         .await
         .map_err(error_reporter::Report::new)
         .map_err(ServerFnError::new)?;
@@ -187,7 +125,7 @@ pub(crate) async fn get_user_interaction(
 #[tracing::instrument(err(Debug))]
 pub(crate) async fn get_user_interactions(
     wall_uid: models::WallUid,
-) -> Result<RonEncoded<BTreeMap<models::ProblemUid, models::UserInteraction>>, ServerFnError> {
+) -> Result<RonEncoded<BTreeMap<models::Problem, models::UserInteraction>>, ServerFnError> {
     use crate::server::db::Database;
     use crate::server::db::DatabaseOperationError;
     use leptos::prelude::expect_context;
@@ -198,7 +136,7 @@ pub(crate) async fn get_user_interactions(
         DatabaseOperation(DatabaseOperationError),
     }
 
-    async fn inner(wall_uid: models::WallUid) -> Result<BTreeMap<models::ProblemUid, models::UserInteraction>, Error> {
+    async fn inner(wall_uid: models::WallUid) -> Result<BTreeMap<models::Problem, models::UserInteraction>, Error> {
         let db = expect_context::<Database>();
 
         let user_interactions = db
@@ -224,43 +162,6 @@ pub(crate) async fn get_user_interactions(
     Ok(RonEncoded::new(user_interaction))
 }
 
-#[server(
-    input = Ron,
-    output = Ron,
-    custom = RonEncoded
-)]
-#[tracing::instrument(skip_all, err(Debug))]
-pub(crate) async fn get_problem_by_uid(
-    wall_uid: models::WallUid,
-    problem_uid: models::ProblemUid,
-) -> Result<RonEncoded<models::Problem>, ServerFnError> {
-    use crate::server::db::Database;
-    use crate::server::db::DatabaseOperationError;
-    use leptos::prelude::expect_context;
-    tracing::trace!("Enter");
-
-    #[derive(Debug, derive_more::Error, derive_more::Display)]
-    enum Error {
-        #[display("Problem not found: {_0:?}")]
-        NotFound(#[error(not(source))] models::ProblemUid),
-    }
-
-    let db = expect_context::<Database>();
-    let problem = db
-        .read(|txn| {
-            let table = txn.open_table(crate::server::db::current::TABLE_PROBLEMS)?;
-            let problem = table
-                .get((wall_uid, problem_uid))?
-                .ok_or(Error::NotFound(problem_uid))
-                .map_err(DatabaseOperationError::custom)?
-                .value();
-            Ok(problem)
-        })
-        .await?;
-
-    Ok(RonEncoded::new(problem))
-}
-
 /// Inserts or updates today's attempt.
 #[server(
     input = Ron,
@@ -270,7 +171,7 @@ pub(crate) async fn get_problem_by_uid(
 #[tracing::instrument(err(Debug))]
 pub(crate) async fn upsert_todays_attempt(
     wall_uid: models::WallUid,
-    problem_uid: models::ProblemUid,
+    problem: models::Problem,
     attempt: Option<models::Attempt>,
 ) -> Result<RonEncoded<models::UserInteraction>, ServerFnError> {
     use crate::server::db::Database;
@@ -287,20 +188,20 @@ pub(crate) async fn upsert_todays_attempt(
         DatabaseOperation(DatabaseOperationError),
     }
 
-    async fn inner(wall_uid: models::WallUid, problem_uid: models::ProblemUid, attempt: Option<models::Attempt>) -> Result<UserInteraction, Error> {
+    async fn inner(wall_uid: models::WallUid, problem: models::Problem, attempt: Option<models::Attempt>) -> Result<UserInteraction, Error> {
         let db = expect_context::<Database>();
 
         let user_interaction = db
             .write(|txn| {
                 let mut user_table = txn.open_table(crate::server::db::current::TABLE_USER)?;
 
-                let key = (wall_uid, problem_uid);
+                let key = (wall_uid, problem);
 
                 // Pop or default
                 let mut user_interaction = user_table
                     .remove(key)?
                     .map(|guard| guard.value())
-                    .unwrap_or_else(|| models::UserInteraction::new(wall_uid, problem_uid));
+                    .unwrap_or_else(|| models::UserInteraction::new(wall_uid, problem));
 
                 // If the last entry is from today, remove it
                 if let Some(entry) = user_interaction.attempted_on.last_entry() {
@@ -327,7 +228,7 @@ pub(crate) async fn upsert_todays_attempt(
         Ok(user_interaction)
     }
 
-    inner(wall_uid, problem_uid, attempt)
+    inner(wall_uid, problem, attempt)
         .await
         .map_err(error_reporter::Report::new)
         .map_err(ServerFnError::new)
diff --git a/notes.txt b/notes.txt
new file mode 100644
index 0000000..d0c5490
--- /dev/null
+++ b/notes.txt
@@ -0,0 +1,16 @@
+# Random selection: Sample from filtered
+[patterns with variations that satisfy filter]
+	[variations]
+
+# Random selection no filter: Sample equally weighted patterns
+[patterns]
+	[random variation within pattern]
+
+Normalize: shift left, and use minimum of mirrored pattern pair
+
+
+# Filter stats:
+patterns: X
+pattern variations: Y
+
+