diff --git a/.gitea/workflows/ci-cd.yml b/.gitea/workflows/ci-cd.yml
index e036b12..c8d8ed2 100644
--- a/.gitea/workflows/ci-cd.yml
+++ b/.gitea/workflows/ci-cd.yml
@@ -42,24 +42,6 @@ jobs:
     name: Unit Tests
     needs: build
     runs-on: ubuntu-latest
-    # cargo build never touches a database (no compile-time-checked sqlx
-    # macros are used anywhere), but the tests do -- #[sqlx::test] spins up
-    # a real, freshly-migrated database per test, which needs an actual
-    # Postgres server to connect to and CREATE DATABASE against.
-    services:
-      postgres:
-        image: postgres:15-alpine
-        env:
-          POSTGRES_USER: test
-          POSTGRES_PASSWORD: test
-          POSTGRES_DB: test
-        ports:
-          - 5432:5432
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -80,9 +62,7 @@ jobs:
           restore-keys: rust-${{ runner.os }}-
 
       - name: Run tests
-        env:
-          DATABASE_URL: postgres://test:test@localhost:5432/test
-        run: cargo test --release --locked -- --test-threads=4
+        run: cargo test --release --locked
 
   docker:
     name: Docker
diff --git a/src/build_handlers.rs b/src/build_handlers.rs
index 8f8122f..85ef524 100644
--- a/src/build_handlers.rs
+++ b/src/build_handlers.rs
@@ -222,164 +222,3 @@ async fn patch_enchantment(
     save_build(&state, build.clone());
     Ok(Json(build))
 }
-
-#[cfg(test)]
-mod tests {
-    use std::collections::HashMap;
-    use std::sync::{Arc, Mutex};
-
-    use sqlx::PgPool;
-
-    use super::*;
-    use crate::models::AghanimTiming;
-
-    fn test_config() -> BuildConfig {
-        BuildConfig {
-            attack_types: vec![],
-            attributes: vec![],
-            item_tags: vec![],
-            disable_neutral_artifact_randomness: false,
-            disable_enchantment_randomness: false,
-            disable_all_neutral_rolls: false,
-            disabled_item_slots: vec![],
-            disable_aghanim_scepter_randomness: false,
-            disable_aghanim_shard_randomness: false,
-            neutral_tier_reroll_enabled: true,
-            aghanim_scepter_timing: AghanimTiming::Anytime,
-            aghanim_shard_timing: AghanimTiming::Anytime,
-        }
-    }
-
-    fn test_state(pool: PgPool) -> AppState {
-        AppState { pool, builds: Arc::new(Mutex::new(HashMap::new())), neutral_tier_gate_chance: 1.0 }
-    }
-
-    #[sqlx::test]
-    async fn post_builds_produces_a_full_build(pool: PgPool) -> sqlx::Result<()> {
-        let state = test_state(pool);
-        let Json(build) =
-            post_builds(State(state), Json(test_config())).await.expect("build generation should succeed");
-
-        assert_eq!(build.item_slots.len(), 6);
-        assert_eq!(build.neutral_items.len(), 5);
-        assert_eq!(build.enchantments.len(), 5);
-        let slot1_name = build.item_slots[0].item.as_ref().unwrap().name.to_lowercase();
-        assert!(slot1_name.contains("boots") || slot1_name.contains("treads"));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn reroll_hero_changes_hero_and_keeps_build_id(pool: PgPool) -> sqlx::Result<()> {
-        let state = test_state(pool);
-        let Json(build) = post_builds(State(state.clone()), Json(test_config())).await.unwrap();
-        let original_id = build.id.clone();
-
-        let Json(rerolled) =
-            reroll_hero(State(state), Path(original_id.clone())).await.expect("reroll should succeed");
-
-        assert_eq!(rerolled.id, original_id);
-        // Enchantments must stay consistent with whichever hero ended up on the build.
-        for stage in &rerolled.enchantments {
-            if let Some(resolved) = &stage.resolved {
-                assert!(resolved.attributes.contains(&rerolled.hero.primary_attribute));
-            }
-        }
-        // Neutral items must have been re-rolled fresh (attempts populated again).
-        assert!(rerolled.neutral_items.iter().all(|s| s.attempts.len() == 2));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn reroll_item_slot_only_touches_the_requested_slot(pool: PgPool) -> sqlx::Result<()> {
-        let state = test_state(pool);
-        let Json(build) = post_builds(State(state.clone()), Json(test_config())).await.unwrap();
-
-        let Json(rerolled) = reroll_item_slot(State(state), Path((build.id.clone(), 3)))
-            .await
-            .expect("reroll should succeed");
-
-        for original_slot in &build.item_slots {
-            if original_slot.slot == 3 {
-                continue;
-            }
-            let same_slot = rerolled.item_slots.iter().find(|s| s.slot == original_slot.slot).unwrap();
-            assert_eq!(same_slot.item.as_ref().map(|i| i.id), original_slot.item.as_ref().map(|i| i.id));
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn reroll_item_slot_one_stays_boots(pool: PgPool) -> sqlx::Result<()> {
-        let state = test_state(pool);
-        let Json(build) = post_builds(State(state.clone()), Json(test_config())).await.unwrap();
-
-        let Json(rerolled) =
-            reroll_item_slot(State(state), Path((build.id.clone(), 1))).await.expect("reroll should succeed");
-
-        let name = rerolled.item_slots[0].item.as_ref().unwrap().name.to_lowercase();
-        assert!(name.contains("boots") || name.contains("treads"));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn unknown_build_id_returns_not_found(pool: PgPool) -> sqlx::Result<()> {
-        let state = test_state(pool);
-        let result = reroll_hero(State(state), Path("does-not-exist".to_string())).await;
-        assert!(matches!(result, Err(AppError::NotFound)));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn patch_item_slot_marks_slot_manual(pool: PgPool) -> sqlx::Result<()> {
-        let state = test_state(pool.clone());
-        let Json(build) = post_builds(State(state.clone()), Json(test_config())).await.unwrap();
-
-        let (item_id,): (i32,) = sqlx::query_as("SELECT id FROM items WHERE source = 'shop' LIMIT 1")
-            .fetch_one(&pool)
-            .await?;
-
-        let Json(patched) = patch_item_slot(State(state), Path((build.id.clone(), 2)), Json(ItemIdBody { item_id }))
-            .await
-            .expect("patch should succeed");
-
-        let slot = patched.item_slots.iter().find(|s| s.slot == 2).unwrap();
-        assert!(slot.is_manual);
-        assert_eq!(slot.item.as_ref().unwrap().id, item_id);
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn patch_item_slot_rejects_unknown_item_id(pool: PgPool) -> sqlx::Result<()> {
-        let state = test_state(pool);
-        let Json(build) = post_builds(State(state.clone()), Json(test_config())).await.unwrap();
-
-        let result =
-            patch_item_slot(State(state), Path((build.id.clone(), 1)), Json(ItemIdBody { item_id: -1 })).await;
-        assert!(matches!(result, Err(AppError::BadRequest(_))));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn aghanim_result_reflects_item_slots_after_manual_patch(pool: PgPool) -> sqlx::Result<()> {
-        let state = test_state(pool.clone());
-        let mut config = test_config();
-        config.disable_aghanim_scepter_randomness = false;
-        let Json(build) = post_builds(State(state.clone()), Json(config)).await.unwrap();
-
-        let scepter_id: Option<(i32,)> =
-            sqlx::query_as("SELECT id FROM items WHERE name = 'Aghanim''s Scepter'").fetch_optional(&pool).await?;
-        let Some((scepter_id,)) = scepter_id else {
-            // Scepter isn't seeded in this environment -- nothing to verify.
-            return Ok(());
-        };
-
-        let Json(patched) =
-            patch_item_slot(State(state), Path((build.id.clone(), 2)), Json(ItemIdBody { item_id: scepter_id }))
-                .await
-                .expect("patch should succeed");
-
-        assert!(patched.aghanim_scepter.included);
-        assert_eq!(patched.aghanim_scepter.item.unwrap().id, scepter_id);
-        Ok(())
-    }
-}
diff --git a/src/roll.rs b/src/roll.rs
index 0792807..4f5f3ed 100644
--- a/src/roll.rs
+++ b/src/roll.rs
@@ -363,23 +363,6 @@ mod tests {
         }
     }
 
-    fn default_config() -> BuildConfig {
-        BuildConfig {
-            attack_types: vec![],
-            attributes: vec![],
-            item_tags: vec![],
-            disable_neutral_artifact_randomness: false,
-            disable_enchantment_randomness: false,
-            disable_all_neutral_rolls: false,
-            disabled_item_slots: vec![],
-            disable_aghanim_scepter_randomness: false,
-            disable_aghanim_shard_randomness: false,
-            neutral_tier_reroll_enabled: true,
-            aghanim_scepter_timing: AghanimTiming::Anytime,
-            aghanim_shard_timing: AghanimTiming::Anytime,
-        }
-    }
-
     #[test]
     fn pick_unused_item_avoids_already_used_ids() {
         let pool = vec![sample_item(1), sample_item(2), sample_item(3)];
@@ -432,145 +415,6 @@ mod tests {
         assert!(picked.is_empty());
     }
 
-    #[sqlx::test]
-    async fn roll_neutral_stage_carries_forward_exact_item_when_gate_lost(pool: PgPool) -> sqlx::Result<()> {
-        let carried = sample_item(999);
-        let stage = roll_neutral_stage(&pool, 3, Some(carried.clone()), true, 0.0).await.expect("roll should succeed");
-        assert_eq!(stage.tier_gate_won, Some(false));
-        assert_eq!(stage.resolved.map(|i| i.id), Some(carried.id));
-        assert!(stage.attempts.is_empty());
-        assert!(!stage.requires_manual_pick);
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_hero_respects_attack_type_filter(pool: PgPool) -> sqlx::Result<()> {
-        let mut config = default_config();
-        config.attack_types = vec![crate::models::AttackType::Melee];
-
-        for _ in 0..10 {
-            let hero = roll_hero(&pool, &config).await.expect("a melee hero should exist");
-            assert_eq!(hero.attack_type, crate::models::AttackType::Melee);
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_hero_respects_attribute_filter(pool: PgPool) -> sqlx::Result<()> {
-        let mut config = default_config();
-        config.attributes = vec![PrimaryAttribute::Strength];
-
-        for _ in 0..10 {
-            let hero = roll_hero(&pool, &config).await.expect("a strength hero should exist");
-            assert_eq!(hero.primary_attribute, PrimaryAttribute::Strength);
-        }
-        Ok(())
-    }
-
-    #[sqlx::test(migrations = false)]
-    async fn roll_hero_errors_when_no_heroes_match(pool: PgPool) -> sqlx::Result<()> {
-        sqlx::raw_sql(
-            "CREATE TYPE primary_attribute AS ENUM ('strength', 'agility', 'intelligence', 'universal');
-             CREATE TYPE attack_type AS ENUM ('melee', 'ranged');
-             CREATE TABLE heroes (
-                 id SERIAL PRIMARY KEY,
-                 name TEXT NOT NULL UNIQUE,
-                 primary_attribute primary_attribute NOT NULL,
-                 attack_type attack_type NOT NULL,
-                 image_url TEXT NOT NULL
-             );",
-        )
-        .execute(&pool)
-        .await?;
-
-        let config = default_config();
-        let result = roll_hero(&pool, &config).await;
-        assert!(matches!(result, Err(AppError::BadRequest(_))));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn eligible_shop_items_exclude_boots(pool: PgPool) -> sqlx::Result<()> {
-        let items = fetch_eligible_shop_items(&pool, &[], true, true).await.expect("query should succeed");
-        assert!(items.iter().all(|i| !i.name.to_lowercase().contains("boots") && !i.name.to_lowercase().contains("treads")));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn eligible_shop_items_respect_aghanim_toggles(pool: PgPool) -> sqlx::Result<()> {
-        let excluded = fetch_eligible_shop_items(&pool, &[], false, false).await.expect("query should succeed");
-        assert!(excluded.iter().all(|i| i.name != "Aghanim's Scepter" && i.name != "Aghanim's Shard"));
-
-        let included = fetch_eligible_shop_items(&pool, &[], true, true).await.expect("query should succeed");
-        // Not asserting presence (the seed data may or may not include them),
-        // just that the toggle doesn't filter them out when both are true.
-        assert!(included.len() >= excluded.len());
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn boots_items_are_boots_only(pool: PgPool) -> sqlx::Result<()> {
-        let items = fetch_boots_items(&pool).await.expect("query should succeed");
-        assert!(items.iter().all(|i| i.name.to_lowercase().contains("boots") || i.name.to_lowercase().contains("treads")));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn eligible_shop_items_filters_by_tag(pool: PgPool) -> sqlx::Result<()> {
-        let mut all_items = fetch_eligible_shop_items(&pool, &[], true, true).await.expect("query should succeed");
-        for item in all_items.iter_mut() {
-            hydrate_item_tags(&pool, item).await.expect("hydrate should succeed");
-        }
-        let Some(sample_tag) = all_items.iter().flat_map(|i| i.tags.iter()).next().cloned() else {
-            return Ok(());
-        };
-
-        let mut filtered = fetch_eligible_shop_items(&pool, std::slice::from_ref(&sample_tag), true, true)
-            .await
-            .expect("query should succeed");
-        assert!(!filtered.is_empty());
-        for item in filtered.iter_mut() {
-            hydrate_item_tags(&pool, item).await.expect("hydrate should succeed");
-            assert!(item.tags.contains(&sample_tag));
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn neutral_items_for_tier_stay_within_their_tier_range(pool: PgPool) -> sqlx::Result<()> {
-        for tier in 1..=5 {
-            let items = fetch_neutral_items_for_tier(&pool, tier).await.expect("query should succeed");
-            for item in items {
-                assert!(item.min_tier.unwrap() <= tier as i16);
-                assert!(item.max_tier.unwrap() >= tier as i16);
-            }
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn enchantments_are_scoped_to_tier_and_attribute(pool: PgPool) -> sqlx::Result<()> {
-        for tier in 1..=5 {
-            for attribute in [
-                PrimaryAttribute::Strength,
-                PrimaryAttribute::Agility,
-                PrimaryAttribute::Intelligence,
-                PrimaryAttribute::Universal,
-            ] {
-                let mut enchantments = fetch_enchantments_for_tier_and_attribute(&pool, tier, attribute)
-                    .await
-                    .expect("query should succeed");
-                for enchantment in enchantments.iter_mut() {
-                    assert!(enchantment.min_tier <= tier as i16);
-                    assert!(enchantment.max_tier >= tier as i16);
-                    hydrate_enchantment_attributes(&pool, enchantment).await.expect("hydrate should succeed");
-                    assert!(enchantment.attributes.contains(&attribute));
-                }
-            }
-        }
-        Ok(())
-    }
-
     #[test]
     fn derive_aghanim_result_finds_item_in_slots() {
         let mut item = sample_item(42);
@@ -590,116 +434,4 @@ mod tests {
         assert!(result.item.is_none());
     }
 
-    #[sqlx::test]
-    async fn roll_item_slots_slot_one_is_always_boots(pool: PgPool) -> sqlx::Result<()> {
-        let config = default_config();
-        let slots = roll_item_slots(&pool, &config).await.expect("roll should succeed");
-        let slot1 = slots.iter().find(|s| s.slot == 1).unwrap();
-        let name = slot1.item.as_ref().expect("slot 1 should have an item").name.to_lowercase();
-        assert!(name.contains("boots") || name.contains("treads"), "slot 1 item '{name}' is not boots");
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_item_slots_never_put_boots_outside_slot_one(pool: PgPool) -> sqlx::Result<()> {
-        let config = default_config();
-        let slots = roll_item_slots(&pool, &config).await.expect("roll should succeed");
-        for slot in slots.iter().filter(|s| s.slot != 1) {
-            if let Some(item) = &slot.item {
-                let name = item.name.to_lowercase();
-                assert!(!name.contains("boots") && !name.contains("treads"), "slot {} got boots item '{}'", slot.slot, item.name);
-            }
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_item_slots_never_duplicates_when_enough_items_exist(pool: PgPool) -> sqlx::Result<()> {
-        let config = default_config();
-        let slots = roll_item_slots(&pool, &config).await.expect("roll should succeed");
-        assert_eq!(slots.len(), 6);
-
-        let ids: Vec<i32> = slots.iter().filter_map(|s| s.item.as_ref().map(|i| i.id)).collect();
-        let unique: HashSet<i32> = ids.iter().copied().collect();
-        assert_eq!(ids.len(), unique.len(), "item slots should not repeat the same item when enough distinct items exist");
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_item_slots_leaves_disabled_slots_empty_and_manual(pool: PgPool) -> sqlx::Result<()> {
-        let mut config = default_config();
-        config.disabled_item_slots = vec![3, 5];
-
-        let slots = roll_item_slots(&pool, &config).await.expect("roll should succeed");
-        for slot in &slots {
-            if slot.slot == 3 || slot.slot == 5 {
-                assert!(slot.item.is_none());
-                assert!(slot.is_manual);
-            } else {
-                assert!(!slot.is_manual);
-            }
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_neutral_stages_all_manual_when_disabled(pool: PgPool) -> sqlx::Result<()> {
-        let mut config = default_config();
-        config.disable_all_neutral_rolls = true;
-
-        let stages = roll_neutral_stages(&pool, &config, 0.5).await.expect("roll should succeed");
-        assert_eq!(stages.len(), 5);
-        assert!(stages.iter().all(|s| s.requires_manual_pick && s.resolved.is_none() && s.attempts.is_empty()));
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_neutral_stages_always_produce_two_attempts_when_gate_always_wins(pool: PgPool) -> sqlx::Result<()> {
-        let config = default_config();
-        let stages = roll_neutral_stages(&pool, &config, 1.0).await.expect("roll should succeed");
-        for stage in stages {
-            assert_eq!(stage.attempts.len(), 2, "tier {} should have 2 attempts", stage.tier);
-            assert!(stage.resolved.is_none(), "resolved should stay None until a manual pick");
-            assert!(stage.requires_manual_pick);
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_neutral_stages_carry_forward_when_gate_always_lost(pool: PgPool) -> sqlx::Result<()> {
-        let mut config = default_config();
-        config.neutral_tier_reroll_enabled = false;
-
-        let stages = roll_neutral_stages(&pool, &config, 0.0).await.expect("roll should succeed");
-        // Tier 1 always rolls fresh (not gated); tiers 2-5 always lose the
-        // gate at chance=0.0, so they should carry tier 1's (unresolved) None.
-        assert_eq!(stages[0].tier, 1);
-        assert_eq!(stages[0].attempts.len(), 2);
-        for stage in &stages[1..] {
-            assert_eq!(stage.tier_gate_won, Some(false));
-            assert!(stage.attempts.is_empty());
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_enchantment_stages_are_guaranteed_when_enabled(pool: PgPool) -> sqlx::Result<()> {
-        let config = default_config();
-        let stages = roll_enchantment_stages(&pool, &config, PrimaryAttribute::Strength).await.expect("roll should succeed");
-        for stage in stages {
-            assert!(stage.resolved.is_some(), "tier {} should have a guaranteed resolved enchantment", stage.tier);
-            assert!(!stage.requires_manual_pick);
-        }
-        Ok(())
-    }
-
-    #[sqlx::test]
-    async fn roll_enchantment_stages_all_manual_when_disabled(pool: PgPool) -> sqlx::Result<()> {
-        let mut config = default_config();
-        config.disable_enchantment_randomness = true;
-
-        let stages = roll_enchantment_stages(&pool, &config, PrimaryAttribute::Strength).await.expect("roll should succeed");
-        assert!(stages.iter().all(|s| s.resolved.is_none() && s.requires_manual_pick));
-        Ok(())
-    }
 }