diff --git a/src/main/java/com/l2/shots/auth/AdminResetPasswordRequest.java b/src/main/java/com/l2/shots/auth/AdminResetPasswordRequest.java
index 789b71b..bcb1f32 100644
--- a/src/main/java/com/l2/shots/auth/AdminResetPasswordRequest.java
+++ b/src/main/java/com/l2/shots/auth/AdminResetPasswordRequest.java
@@ -1,6 +1,4 @@
 package com.l2.shots.auth;
 
-public class AdminResetPasswordRequest {
-    public String username;
-    public String newPassword;
+public record AdminResetPasswordRequest(String username, String newPassword) {
 }
diff --git a/src/main/java/com/l2/shots/auth/AdminUserSummary.java b/src/main/java/com/l2/shots/auth/AdminUserSummary.java
index 35181f8..587a311 100644
--- a/src/main/java/com/l2/shots/auth/AdminUserSummary.java
+++ b/src/main/java/com/l2/shots/auth/AdminUserSummary.java
@@ -3,22 +3,21 @@ package com.l2.shots.auth;
 import java.time.Instant;
 import java.util.UUID;
 
-public class AdminUserSummary {
-    public UUID id;
-    public String username;
-    public Instant createdAt;
-    public Instant lastLoginAt;
-    public boolean isAdmin;
-    public boolean mustChangePassword;
+public record AdminUserSummary(
+        UUID id,
+        String username,
+        Instant createdAt,
+        Instant lastLoginAt,
+        boolean isAdmin,
+        boolean mustChangePassword) {
 
-    public AdminUserSummary() {}
-
-    public AdminUserSummary(User u) {
-        this.id = u.id;
-        this.username = u.username;
-        this.createdAt = u.createdAt;
-        this.lastLoginAt = u.lastLoginAt;
-        this.isAdmin = u.isAdmin;
-        this.mustChangePassword = u.mustChangePassword;
+    public static AdminUserSummary from(User u) {
+        return new AdminUserSummary(
+                u.id,
+                u.username,
+                u.createdAt,
+                u.lastLoginAt,
+                u.isAdmin,
+                u.mustChangePassword);
     }
 }
diff --git a/src/main/java/com/l2/shots/auth/AuthMeResponse.java b/src/main/java/com/l2/shots/auth/AuthMeResponse.java
index 2c925bb..40184a1 100644
--- a/src/main/java/com/l2/shots/auth/AuthMeResponse.java
+++ b/src/main/java/com/l2/shots/auth/AuthMeResponse.java
@@ -3,20 +3,10 @@ package com.l2.shots.auth;
 import java.time.Instant;
 import java.util.UUID;
 
-public class AuthMeResponse {
-    public UUID id;
-    public String username;
-    public Instant createdAt;
-    public boolean mustChangePassword;
-    public boolean isAdmin;
-
-    public AuthMeResponse() {}
-
-    public AuthMeResponse(UUID id, String username, Instant createdAt, boolean mustChangePassword, boolean isAdmin) {
-        this.id = id;
-        this.username = username;
-        this.createdAt = createdAt;
-        this.mustChangePassword = mustChangePassword;
-        this.isAdmin = isAdmin;
-    }
+public record AuthMeResponse(
+        UUID id,
+        String username,
+        Instant createdAt,
+        boolean mustChangePassword,
+        boolean isAdmin) {
 }
diff --git a/src/main/java/com/l2/shots/auth/AuthResource.java b/src/main/java/com/l2/shots/auth/AuthResource.java
index e8fc729..e41585f 100644
--- a/src/main/java/com/l2/shots/auth/AuthResource.java
+++ b/src/main/java/com/l2/shots/auth/AuthResource.java
@@ -42,7 +42,7 @@ public class AuthResource {
     @POST
     @Path("/register")
     public Response register(Credentials creds) {
-        Optional<User> result = authService.register(creds.username, creds.password);
+        Optional<User> result = authService.register(creds.username(), creds.password());
         if (result.isEmpty()) {
             return Response.status(409)
                     .entity(new ErrorBody("username no disponible o datos inválidos"))
@@ -58,7 +58,7 @@ public class AuthResource {
     @POST
     @Path("/login")
     public Response login(Credentials creds) {
-        Optional<User> result = authService.authenticate(creds.username, creds.password);
+        Optional<User> result = authService.authenticate(creds.username(), creds.password());
         if (result.isEmpty()) {
             return Response.status(401)
                     .entity(new ErrorBody("credenciales inválidas"))
@@ -83,7 +83,7 @@ public class AuthResource {
     @Path("/change-password")
     @Authenticated
     public Response changePassword(@Context HttpHeaders headers, ChangePasswordRequest body) {
-        if (body == null || body.currentPassword == null || body.newPassword == null) {
+        if (body == null || body.currentPassword() == null || body.newPassword() == null) {
             return Response.status(400).entity(new ErrorBody("Faltan campos requeridos")).build();
         }
         Optional<JsonWebToken> jwt = jwtCookieAuth.extractToken(headers);
@@ -91,7 +91,7 @@ public class AuthResource {
         Optional<User> user = authService.getEntityFromToken(jwt.get());
         if (user.isEmpty()) return Response.status(401).build();
         AuthService.ChangePasswordResult result = authService.changePassword(
-                user.get().id, body.currentPassword, body.newPassword);
+                user.get().id, body.currentPassword(), body.newPassword());
         switch (result) {
             case OK:
                 User refreshed = User.findById(user.get().id);
@@ -116,7 +116,7 @@ public class AuthResource {
     @Path("/admin/reset-password")
     @RolesAllowed("admin")
     public Response adminResetPassword(AdminResetPasswordRequest body) {
-        if (body == null || body.username == null || body.newPassword == null) {
+        if (body == null || body.username() == null || body.newPassword() == null) {
             return Response.status(400).entity(new ErrorBody("Faltan campos requeridos")).build();
         }
         UUID requesterId;
@@ -125,7 +125,7 @@ public class AuthResource {
         } catch (Exception e) {
             return Response.status(401).build();
         }
-        boolean ok = authService.resetPasswordAsAdmin(requesterId, body.username, body.newPassword);
+        boolean ok = authService.resetPasswordAsAdmin(requesterId, body.username(), body.newPassword());
         if (!ok) {
             return Response.status(400).entity(new ErrorBody("Usuario no encontrado o contraseña inválida")).build();
         }
@@ -180,9 +180,6 @@ public class AuthResource {
                 .build();
     }
 
-    public static class ErrorBody {
-        public String error;
-        public ErrorBody() {}
-        public ErrorBody(String error) { this.error = error; }
+    public record ErrorBody(String error) {
     }
 }
diff --git a/src/main/java/com/l2/shots/auth/AuthService.java b/src/main/java/com/l2/shots/auth/AuthService.java
index 15349c7..395d94e 100644
--- a/src/main/java/com/l2/shots/auth/AuthService.java
+++ b/src/main/java/com/l2/shots/auth/AuthService.java
@@ -77,7 +77,7 @@ public class AuthService {
 
     public java.util.List<AdminUserSummary> listUsersForAdmin() {
         return User.<User>listAll().stream()
-                .map(AdminUserSummary::new)
+                .map(AdminUserSummary::from)
                 .collect(java.util.stream.Collectors.toList());
     }
 
diff --git a/src/main/java/com/l2/shots/auth/ChangePasswordRequest.java b/src/main/java/com/l2/shots/auth/ChangePasswordRequest.java
index cc66d9b..817f9db 100644
--- a/src/main/java/com/l2/shots/auth/ChangePasswordRequest.java
+++ b/src/main/java/com/l2/shots/auth/ChangePasswordRequest.java
@@ -1,6 +1,4 @@
 package com.l2.shots.auth;
 
-public class ChangePasswordRequest {
-    public String currentPassword;
-    public String newPassword;
+public record ChangePasswordRequest(String currentPassword, String newPassword) {
 }
diff --git a/src/main/java/com/l2/shots/auth/Credentials.java b/src/main/java/com/l2/shots/auth/Credentials.java
index 21f7dcd..369d3d2 100644
--- a/src/main/java/com/l2/shots/auth/Credentials.java
+++ b/src/main/java/com/l2/shots/auth/Credentials.java
@@ -1,6 +1,4 @@
 package com.l2.shots.auth;
 
-public class Credentials {
-    public String username;
-    public String password;
+public record Credentials(String username, String password) {
 }
diff --git a/src/main/java/com/l2/shots/auth/MustChangePasswordFilter.java b/src/main/java/com/l2/shots/auth/MustChangePasswordFilter.java
index d2dfcf1..699d44f 100644
--- a/src/main/java/com/l2/shots/auth/MustChangePasswordFilter.java
+++ b/src/main/java/com/l2/shots/auth/MustChangePasswordFilter.java
@@ -60,8 +60,9 @@ public class MustChangePasswordFilter implements ContainerRequestFilter {
                 .build());
     }
 
-    public static class MustChangeBody {
-        public String error = "Debe cambiar la contraseña antes de continuar";
-        public boolean mustChangePassword = true;
+    public record MustChangeBody(String error, boolean mustChangePassword) {
+        public MustChangeBody() {
+            this("Debe cambiar la contraseña antes de continuar", true);
+        }
     }
 }
diff --git a/src/main/java/com/l2/shots/history/HistoryResource.java b/src/main/java/com/l2/shots/history/HistoryResource.java
index 0cdd162..ffc4d2c 100644
--- a/src/main/java/com/l2/shots/history/HistoryResource.java
+++ b/src/main/java/com/l2/shots/history/HistoryResource.java
@@ -36,16 +36,16 @@ public class HistoryResource {
         Optional<UUID> userId = extractUserId(headers);
         if (userId.isEmpty()) return Response.status(401).build();
 
-        if (input == null || input.items == null || input.snapshot == null) {
+        if (input == null || input.items() == null || input.snapshot() == null) {
             return Response.status(400).entity("{\"error\":\"payload inválido\"}").build();
         }
-        if (input.items.size() > 100) {
+        if (input.items().size() > 100) {
             return Response.status(400).entity("{\"error\":\"demasiados items\"}").build();
         }
-        if (input.label != null && input.label.length() > 100) {
+        if (input.label() != null && input.label().length() > 100) {
             return Response.status(400).entity("{\"error\":\"label demasiado largo\"}").build();
         }
-        if (input.totalCristalesUsed <= 0) {
+        if (input.totalCristalesUsed() <= 0) {
             return Response.status(400).entity("{\"error\":\"no hay cristales usados\"}").build();
         }
 
diff --git a/src/main/java/com/l2/shots/history/HistoryService.java b/src/main/java/com/l2/shots/history/HistoryService.java
index 9f48f69..9db887d 100644
--- a/src/main/java/com/l2/shots/history/HistoryService.java
+++ b/src/main/java/com/l2/shots/history/HistoryService.java
@@ -18,7 +18,7 @@ public class HistoryService {
     public List<RunSummary> listForUser(UUID userId) {
         return ProductionRun.<ProductionRun>list("userId = ?1 ORDER BY createdAt DESC", userId)
                 .stream()
-                .map(RunSummary::new)
+                .map(RunSummary::from)
                 .toList();
     }
 
@@ -29,7 +29,7 @@ public class HistoryService {
             List<RunItem> items = mapper.readValue(entity.itemsJson, mapper.getTypeFactory()
                     .constructCollectionType(List.class, RunItem.class));
             RunSnapshot snapshot = mapper.readValue(entity.snapshotJson, RunSnapshot.class);
-            return Optional.of(new RunDetails(entity, items, snapshot));
+            return Optional.of(RunDetails.of(entity, items, snapshot));
         } catch (JsonProcessingException e) {
             return Optional.empty();
         }
@@ -41,21 +41,21 @@ public class HistoryService {
         entity.id = UUID.randomUUID();
         entity.userId = userId;
         entity.createdAt = Instant.now();
-        entity.label = input.label;
-        entity.totalCost = input.totalCost;
-        entity.totalSale = input.totalSale;
-        entity.totalProfit = input.totalProfit;
-        entity.totalShots = input.totalShots;
-        entity.totalCristalesUsed = input.totalCristalesUsed;
-        entity.totalOreUsed = input.totalOreUsed;
+        entity.label = input.label();
+        entity.totalCost = input.totalCost();
+        entity.totalSale = input.totalSale();
+        entity.totalProfit = input.totalProfit();
+        entity.totalShots = input.totalShots();
+        entity.totalCristalesUsed = input.totalCristalesUsed();
+        entity.totalOreUsed = input.totalOreUsed();
         try {
-            entity.itemsJson = mapper.writeValueAsString(input.items);
-            entity.snapshotJson = mapper.writeValueAsString(input.snapshot);
+            entity.itemsJson = mapper.writeValueAsString(input.items());
+            entity.snapshotJson = mapper.writeValueAsString(input.snapshot());
         } catch (JsonProcessingException e) {
             throw new RuntimeException("Failed to serialize run payload", e);
         }
         entity.persist();
-        return new RunSummary(entity);
+        return RunSummary.from(entity);
     }
 
     @Transactional
@@ -67,22 +67,8 @@ public class HistoryService {
         List<ProductionRun> runs = ProductionRun.list(
                 "userId = ?1 ORDER BY createdAt DESC", userId);
 
-        HistoryStats stats = new HistoryStats();
-        stats.totalRuns = runs.size();
-
         if (runs.isEmpty()) {
-            stats.totalCost = 0;
-            stats.totalSale = 0;
-            stats.totalProfit = 0;
-            stats.totalShots = 0;
-            stats.avgProfit = 0;
-            stats.avgCost = 0;
-            stats.avgSale = 0;
-            stats.bestRun = null;
-            stats.worstRun = null;
-            stats.last5Avg = 0;
-            stats.last10Avg = 0;
-            return stats;
+            return new HistoryStats(0, 0, 0, 0, 0, 0, 0, 0, null, null, 0, 0);
         }
 
         long totalCost = 0;
@@ -101,27 +87,28 @@ public class HistoryService {
             if (r.totalProfit < worst.totalProfit) worst = r;
         }
 
-        stats.totalCost = totalCost;
-        stats.totalSale = totalSale;
-        stats.totalProfit = totalProfit;
-        stats.totalShots = totalShots;
-        stats.avgProfit = totalProfit / runs.size();
-        stats.avgCost = totalCost / runs.size();
-        stats.avgSale = totalSale / runs.size();
-        stats.bestRun = new RunSummary(best);
-        stats.worstRun = new RunSummary(worst);
-
-        int n5 = Math.min(5, runs.size());
-        int n10 = Math.min(10, runs.size());
+        int n = runs.size();
+        int n5 = Math.min(5, n);
+        int n10 = Math.min(10, n);
         long sum5 = 0;
         long sum10 = 0;
         for (int i = 0; i < n10; i++) {
             sum10 += runs.get(i).totalProfit;
             if (i < n5) sum5 += runs.get(i).totalProfit;
         }
-        stats.last5Avg = n5 > 0 ? sum5 / n5 : 0;
-        stats.last10Avg = n10 > 0 ? sum10 / n10 : 0;
 
-        return stats;
+        return new HistoryStats(
+                n,
+                totalCost,
+                totalSale,
+                totalProfit,
+                totalShots,
+                totalProfit / n,
+                totalCost / n,
+                totalSale / n,
+                RunSummary.from(best),
+                RunSummary.from(worst),
+                n5 > 0 ? sum5 / n5 : 0,
+                n10 > 0 ? sum10 / n10 : 0);
     }
 }
diff --git a/src/main/java/com/l2/shots/history/HistoryStats.java b/src/main/java/com/l2/shots/history/HistoryStats.java
index 2b7b2a1..72a6ed9 100644
--- a/src/main/java/com/l2/shots/history/HistoryStats.java
+++ b/src/main/java/com/l2/shots/history/HistoryStats.java
@@ -1,16 +1,16 @@
 package com.l2.shots.history;
 
-public class HistoryStats {
-    public int totalRuns;
-    public long totalCost;
-    public long totalSale;
-    public long totalProfit;
-    public long totalShots;
-    public long avgProfit;
-    public long avgCost;
-    public long avgSale;
-    public RunSummary bestRun;
-    public RunSummary worstRun;
-    public long last5Avg;
-    public long last10Avg;
+public record HistoryStats(
+        int totalRuns,
+        long totalCost,
+        long totalSale,
+        long totalProfit,
+        long totalShots,
+        long avgProfit,
+        long avgCost,
+        long avgSale,
+        RunSummary bestRun,
+        RunSummary worstRun,
+        long last5Avg,
+        long last10Avg) {
 }
diff --git a/src/main/java/com/l2/shots/history/RunDetails.java b/src/main/java/com/l2/shots/history/RunDetails.java
index 4980b55..5a0fac0 100644
--- a/src/main/java/com/l2/shots/history/RunDetails.java
+++ b/src/main/java/com/l2/shots/history/RunDetails.java
@@ -1,16 +1,34 @@
 package com.l2.shots.history;
 
+import java.time.Instant;
 import java.util.List;
+import java.util.UUID;
 
-public class RunDetails extends RunSummary {
-    public List<RunItem> items;
-    public RunSnapshot snapshot;
+public record RunDetails(
+        UUID id,
+        Instant createdAt,
+        String label,
+        long totalCost,
+        long totalSale,
+        long totalProfit,
+        long totalShots,
+        long totalCristalesUsed,
+        long totalOreUsed,
+        List<RunItem> items,
+        RunSnapshot snapshot) {
 
-    public RunDetails() {}
-
-    public RunDetails(ProductionRun r, List<RunItem> items, RunSnapshot snapshot) {
-        super(r);
-        this.items = items;
-        this.snapshot = snapshot;
+    public static RunDetails of(ProductionRun r, List<RunItem> items, RunSnapshot snapshot) {
+        return new RunDetails(
+                r.id,
+                r.createdAt,
+                r.label,
+                r.totalCost,
+                r.totalSale,
+                r.totalProfit,
+                r.totalShots,
+                r.totalCristalesUsed,
+                r.totalOreUsed,
+                items,
+                snapshot);
     }
 }
diff --git a/src/main/java/com/l2/shots/history/RunIn.java b/src/main/java/com/l2/shots/history/RunIn.java
index f758e06..21649fc 100644
--- a/src/main/java/com/l2/shots/history/RunIn.java
+++ b/src/main/java/com/l2/shots/history/RunIn.java
@@ -2,14 +2,14 @@ package com.l2.shots.history;
 
 import java.util.List;
 
-public class RunIn {
-    public String label;
-    public long totalCost;
-    public long totalSale;
-    public long totalProfit;
-    public long totalShots;
-    public long totalCristalesUsed;
-    public long totalOreUsed;
-    public List<RunItem> items;
-    public RunSnapshot snapshot;
+public record RunIn(
+        String label,
+        long totalCost,
+        long totalSale,
+        long totalProfit,
+        long totalShots,
+        long totalCristalesUsed,
+        long totalOreUsed,
+        List<RunItem> items,
+        RunSnapshot snapshot) {
 }
diff --git a/src/main/java/com/l2/shots/history/RunItem.java b/src/main/java/com/l2/shots/history/RunItem.java
index 4e50daf..e578332 100644
--- a/src/main/java/com/l2/shots/history/RunItem.java
+++ b/src/main/java/com/l2/shots/history/RunItem.java
@@ -1,31 +1,14 @@
 package com.l2.shots.history;
 
-public class RunItem {
-    public String tipo;
-    public String grado;
-    public int cristalesDisponibles;
-    public int cristalesUsados;
-    public int oreNecesario;
-    public int crafteosPosibles;
-    public int shotsObtenidos;
-    public long costoTotal;
-    public long valorVenta;
-    public long ganancia;
-
-    public RunItem() {}
-
-    public RunItem(String tipo, String grado, int cristalesDisponibles, int cristalesUsados,
-                   int oreNecesario, int crafteosPosibles, int shotsObtenidos,
-                   long costoTotal, long valorVenta, long ganancia) {
-        this.tipo = tipo;
-        this.grado = grado;
-        this.cristalesDisponibles = cristalesDisponibles;
-        this.cristalesUsados = cristalesUsados;
-        this.oreNecesario = oreNecesario;
-        this.crafteosPosibles = crafteosPosibles;
-        this.shotsObtenidos = shotsObtenidos;
-        this.costoTotal = costoTotal;
-        this.valorVenta = valorVenta;
-        this.ganancia = ganancia;
-    }
+public record RunItem(
+        String tipo,
+        String grado,
+        int cristalesDisponibles,
+        int cristalesUsados,
+        int oreNecesario,
+        int crafteosPosibles,
+        int shotsObtenidos,
+        long costoTotal,
+        long valorVenta,
+        long ganancia) {
 }
diff --git a/src/main/java/com/l2/shots/history/RunSnapshot.java b/src/main/java/com/l2/shots/history/RunSnapshot.java
index 0243d2a..8bbaf46 100644
--- a/src/main/java/com/l2/shots/history/RunSnapshot.java
+++ b/src/main/java/com/l2/shots/history/RunSnapshot.java
@@ -3,14 +3,7 @@ package com.l2.shots.history;
 import java.util.List;
 import java.util.Map;
 
-public class RunSnapshot {
-    public Map<String, Object> insumos;
-    public List<Map<String, Object>> formulas;
-
-    public RunSnapshot() {}
-
-    public RunSnapshot(Map<String, Object> insumos, List<Map<String, Object>> formulas) {
-        this.insumos = insumos;
-        this.formulas = formulas;
-    }
+public record RunSnapshot(
+        Map<String, Object> insumos,
+        List<Map<String, Object>> formulas) {
 }
diff --git a/src/main/java/com/l2/shots/history/RunSummary.java b/src/main/java/com/l2/shots/history/RunSummary.java
index 4b219c1..e0ef5c2 100644
--- a/src/main/java/com/l2/shots/history/RunSummary.java
+++ b/src/main/java/com/l2/shots/history/RunSummary.java
@@ -3,28 +3,27 @@ package com.l2.shots.history;
 import java.time.Instant;
 import java.util.UUID;
 
-public class RunSummary {
-    public UUID id;
-    public Instant createdAt;
-    public String label;
-    public long totalCost;
-    public long totalSale;
-    public long totalProfit;
-    public long totalShots;
-    public long totalCristalesUsed;
-    public long totalOreUsed;
+public record RunSummary(
+        UUID id,
+        Instant createdAt,
+        String label,
+        long totalCost,
+        long totalSale,
+        long totalProfit,
+        long totalShots,
+        long totalCristalesUsed,
+        long totalOreUsed) {
 
-    public RunSummary() {}
-
-    public RunSummary(ProductionRun r) {
-        this.id = r.id;
-        this.createdAt = r.createdAt;
-        this.label = r.label;
-        this.totalCost = r.totalCost;
-        this.totalSale = r.totalSale;
-        this.totalProfit = r.totalProfit;
-        this.totalShots = r.totalShots;
-        this.totalCristalesUsed = r.totalCristalesUsed;
-        this.totalOreUsed = r.totalOreUsed;
+    public static RunSummary from(ProductionRun r) {
+        return new RunSummary(
+                r.id,
+                r.createdAt,
+                r.label,
+                r.totalCost,
+                r.totalSale,
+                r.totalProfit,
+                r.totalShots,
+                r.totalCristalesUsed,
+                r.totalOreUsed);
     }
 }
diff --git a/src/main/java/com/l2/shots/state/AppState.java b/src/main/java/com/l2/shots/state/AppState.java
index 64268a5..f137392 100644
--- a/src/main/java/com/l2/shots/state/AppState.java
+++ b/src/main/java/com/l2/shots/state/AppState.java
@@ -3,57 +3,25 @@ package com.l2.shots.state;
 import java.util.List;
 import java.util.Map;
 
-public class AppState {
+public record AppState(
+        Insumos insumos,
+        List<FormulaDto> formulas,
+        Map<String, Map<String, Integer>> disponibles) {
 
-    public Insumos insumos;
-    public List<FormulaDto> formulas;
-    public Map<String, Map<String, Integer>> disponibles;
-
-    public AppState() {}
-
-    public AppState(Insumos insumos, List<FormulaDto> formulas, Map<String, Map<String, Integer>> disponibles) {
-        this.insumos = insumos;
-        this.formulas = formulas;
-        this.disponibles = disponibles;
+    public record Insumos(
+            Map<String, Integer> cristales,
+            int soulOre,
+            int spiritOre,
+            Map<String, Map<String, Integer>> venta) {
     }
 
-    public static class Insumos {
-        public Map<String, Integer> cristales;
-        public int soulOre;
-        public int spiritOre;
-        public Map<String, Map<String, Integer>> venta;
-
-        public Insumos() {}
-
-        public Insumos(Map<String, Integer> cristales, int soulOre, int spiritOre,
-                       Map<String, Map<String, Integer>> venta) {
-            this.cristales = cristales;
-            this.soulOre = soulOre;
-            this.spiritOre = spiritOre;
-            this.venta = venta;
-        }
-    }
-
-    public static class FormulaDto {
-        public String id;
-        public String tipo;
-        public String grado;
-        public int cristalesReq;
-        public Integer soulOreReq;
-        public Integer spiritOreReq;
-        public int shotsObtenidos;
-
-        public FormulaDto() {}
-
-        public FormulaDto(String id, String tipo, String grado, int cristalesReq,
-                          Integer soulOreReq, Integer spiritOreReq, int shotsObtenidos) {
-            this.id = id;
-            this.tipo = tipo;
-            this.grado = grado;
-            this.cristalesReq = cristalesReq;
-            this.soulOreReq = soulOreReq;
-            this.spiritOreReq = spiritOreReq;
-            this.shotsObtenidos = shotsObtenidos;
-        }
+    public record FormulaDto(
+            String id,
+            String tipo,
+            String grado,
+            int cristalesReq,
+            Integer soulOreReq,
+            Integer spiritOreReq,
+            int shotsObtenidos) {
     }
 }
diff --git a/src/main/java/com/l2/shots/state/StateResource.java b/src/main/java/com/l2/shots/state/StateResource.java
index b0b14fd..b64d7e2 100644
--- a/src/main/java/com/l2/shots/state/StateResource.java
+++ b/src/main/java/com/l2/shots/state/StateResource.java
@@ -43,10 +43,10 @@ public class StateResource {
         Optional<UUID> userId = extractUserId(headers);
         if (userId.isEmpty()) return Response.status(401).build();
 
-        if (state == null || state.insumos == null || state.formulas == null || state.disponibles == null) {
+        if (state == null || state.insumos() == null || state.formulas() == null || state.disponibles() == null) {
             return Response.status(400).entity("{\"error\":\"estado inválido\"}").build();
         }
-        if (state.formulas.size() > 200) {
+        if (state.formulas().size() > 200) {
             return Response.status(400).entity("{\"error\":\"estado demasiado grande\"}").build();
         }
         stateService.saveForUser(userId.get(), state);