diff --git a/main-service/src/main/java/ru/practicum/category/controller/CategoryAdminController.java b/main-service/src/main/java/ru/practicum/category/controller/CategoryAdminController.java
index 4dda309..5495dcd 100644
--- a/main-service/src/main/java/ru/practicum/category/controller/CategoryAdminController.java
+++ b/main-service/src/main/java/ru/practicum/category/controller/CategoryAdminController.java
@@ -4,7 +4,6 @@
 
 import ru.practicum.category.dto.CategoryDto;
 import ru.practicum.category.dto.NewCategoryDto;
-import ru.practicum.category.dto.UpdateCategoryDto;
 import ru.practicum.category.service.CategoryService;
 
 import org.springframework.http.HttpStatus;
@@ -29,7 +28,7 @@ public CategoryDto createCategory(@Valid @RequestBody NewCategoryDto newCategory
 
     @PatchMapping("/{catId}")
     public CategoryDto updateCategory(
-            @PathVariable Long catId, @Valid @RequestBody UpdateCategoryDto updateCategoryDto) {
+            @PathVariable Long catId, @Valid @RequestBody NewCategoryDto updateCategoryDto) {
         log.info(
                 "Update category with id={} requested, updated category {}",
                 catId,
diff --git a/main-service/src/main/java/ru/practicum/category/controller/CategoryPublicController.java b/main-service/src/main/java/ru/practicum/category/controller/CategoryPublicController.java
index 0831614..1ffa2f0 100644
--- a/main-service/src/main/java/ru/practicum/category/controller/CategoryPublicController.java
+++ b/main-service/src/main/java/ru/practicum/category/controller/CategoryPublicController.java
@@ -2,15 +2,20 @@
 
 import java.util.Collection;
 
+import jakarta.validation.constraints.Positive;
+import jakarta.validation.constraints.PositiveOrZero;
+
 import ru.practicum.category.dto.CategoryDto;
 import ru.practicum.category.service.CategoryService;
 
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
+@Validated
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/categories")
@@ -19,8 +24,8 @@ public class CategoryPublicController {
 
     @GetMapping
     public Collection<CategoryDto> getAllCategoriesPaged(
-            @RequestParam(defaultValue = "0") int from,
-            @RequestParam(defaultValue = "10") int size) {
+            @RequestParam(defaultValue = "0") @PositiveOrZero int from,
+            @RequestParam(defaultValue = "10") @Positive int size) {
         log.info("View categories page by page requested from={}, size={}", from, size);
         return categoryService.getAllCategoriesPaged(from, size);
     }
diff --git a/main-service/src/main/java/ru/practicum/category/dto/UpdateCategoryDto.java b/main-service/src/main/java/ru/practicum/category/dto/UpdateCategoryDto.java
deleted file mode 100644
index 58611f4..0000000
--- a/main-service/src/main/java/ru/practicum/category/dto/UpdateCategoryDto.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package ru.practicum.category.dto;
-
-import jakarta.validation.constraints.NotBlank;
-import jakarta.validation.constraints.Size;
-
-public record UpdateCategoryDto(@Size(min = 1, max = 50) @NotBlank String name) {}
diff --git a/main-service/src/main/java/ru/practicum/category/service/CategoryService.java b/main-service/src/main/java/ru/practicum/category/service/CategoryService.java
index 9058f1e..69d5377 100644
--- a/main-service/src/main/java/ru/practicum/category/service/CategoryService.java
+++ b/main-service/src/main/java/ru/practicum/category/service/CategoryService.java
@@ -4,7 +4,6 @@
 
 import ru.practicum.category.dto.CategoryDto;
 import ru.practicum.category.dto.NewCategoryDto;
-import ru.practicum.category.dto.UpdateCategoryDto;
 
 public interface CategoryService {
     CategoryDto createCategory(NewCategoryDto newCategoryDto);
@@ -15,5 +14,5 @@ public interface CategoryService {
 
     void deleteCategoryById(Long id);
 
-    CategoryDto updateCategory(Long catId, UpdateCategoryDto updateCategoryDto);
+    CategoryDto updateCategory(Long catId, NewCategoryDto updateCategoryDto);
 }
diff --git a/main-service/src/main/java/ru/practicum/category/service/CategoryServiceImpl.java b/main-service/src/main/java/ru/practicum/category/service/CategoryServiceImpl.java
index e91d26b..2697af3 100644
--- a/main-service/src/main/java/ru/practicum/category/service/CategoryServiceImpl.java
+++ b/main-service/src/main/java/ru/practicum/category/service/CategoryServiceImpl.java
@@ -4,7 +4,6 @@
 
 import ru.practicum.category.dto.CategoryDto;
 import ru.practicum.category.dto.NewCategoryDto;
-import ru.practicum.category.dto.UpdateCategoryDto;
 import ru.practicum.category.mapper.CategoryMapper;
 import ru.practicum.category.model.Category;
 import ru.practicum.category.repository.CategoryRepository;
@@ -30,7 +29,7 @@ public CategoryDto createCategory(NewCategoryDto newCategoryDto) {
     }
 
     @Override
-    public CategoryDto updateCategory(Long catId, UpdateCategoryDto updateCategoryDto) {
+    public CategoryDto updateCategory(Long catId, NewCategoryDto updateCategoryDto) {
         Category category =
                 categoryRepository
                         .findById(catId)
diff --git a/main-service/src/main/java/ru/practicum/compilation/controller/CompilationsPublicController.java b/main-service/src/main/java/ru/practicum/compilation/controller/CompilationsPublicController.java
index 0f6be83..fbf0812 100644
--- a/main-service/src/main/java/ru/practicum/compilation/controller/CompilationsPublicController.java
+++ b/main-service/src/main/java/ru/practicum/compilation/controller/CompilationsPublicController.java
@@ -2,16 +2,21 @@
 
 import java.util.Collection;
 
+import jakarta.validation.constraints.Positive;
+import jakarta.validation.constraints.PositiveOrZero;
+
 import ru.practicum.compilation.dto.CompilationDto;
 import ru.practicum.compilation.service.CompilationsPublicGetRequest;
 import ru.practicum.compilation.service.CompilationsService;
 
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
+@Validated
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/compilations")
@@ -21,8 +26,8 @@ public class CompilationsPublicController {
     @GetMapping
     public Collection<CompilationDto> getCompilations(
             @RequestParam(required = false) Boolean pinned,
-            @RequestParam(defaultValue = "0") int from,
-            @RequestParam(defaultValue = "10") int size) {
+            @RequestParam(defaultValue = "0") @PositiveOrZero int from,
+            @RequestParam(defaultValue = "10") @Positive int size) {
         CompilationsPublicGetRequest getRequest =
                 new CompilationsPublicGetRequest(pinned, from, size);
         log.info("Public get compilations requested with params= {}", getRequest);
diff --git a/main-service/src/main/java/ru/practicum/compilation/service/CompilationsServiceImpl.java b/main-service/src/main/java/ru/practicum/compilation/service/CompilationsServiceImpl.java
index 32ffbe8..e4e3d1c 100644
--- a/main-service/src/main/java/ru/practicum/compilation/service/CompilationsServiceImpl.java
+++ b/main-service/src/main/java/ru/practicum/compilation/service/CompilationsServiceImpl.java
@@ -1,20 +1,17 @@
 package ru.practicum.compilation.service;
 
-import java.time.LocalDateTime;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.stream.Collectors;
 
-import ru.practicum.client.StatsClient;
 import ru.practicum.compilation.dto.CompilationDto;
 import ru.practicum.compilation.dto.NewCompilationDto;
 import ru.practicum.compilation.dto.UpdateCompilationRequest;
 import ru.practicum.compilation.mapper.CompilationsMapper;
 import ru.practicum.compilation.model.Compilation;
 import ru.practicum.compilation.repository.CompilationsRepository;
-import ru.practicum.dto.ViewStatsDto;
 import ru.practicum.event.dto.EventShortDto;
 import ru.practicum.event.mapper.EventMapper;
 import ru.practicum.event.model.Event;
@@ -35,12 +32,9 @@
 @RequiredArgsConstructor
 @Transactional(readOnly = true)
 public class CompilationsServiceImpl implements CompilationsService {
-    private static final LocalDateTime MINIMAL_LOCAL_DATE_TIME =
-            LocalDateTime.of(1000, 1, 1, 0, 0, 0);
     private final CompilationsRepository compRepository;
     private final EventRepository eventRepository;
     private final ParticipationRequestRepository requestRepository;
-    private final StatsClient statsClient;
 
     @Override
     public Collection<CompilationDto> findAll(CompilationsPublicGetRequest getRequest) {
@@ -52,9 +46,8 @@ public Collection<CompilationDto> findAll(CompilationsPublicGetRequest getReques
                 page.stream().flatMap(c -> c.getEvents().stream()).collect(Collectors.toSet());
 
         Map<Long, Long> confirmedRequests = getConfirmedRequests(events);
-        Map<Long, Long> views = getViews(events);
 
-        return page.stream().map(c -> toDto(c, confirmedRequests, views)).toList();
+        return page.stream().map(c -> toDto(c, confirmedRequests)).toList();
     }
 
     @Override
@@ -70,9 +63,8 @@ public CompilationDto findById(long compId) {
         Set<Event> events = compilation.getEvents();
 
         Map<Long, Long> confirmedRequests = getConfirmedRequests(events);
-        Map<Long, Long> views = getViews(events);
 
-        return toDto(compilation, confirmedRequests, views);
+        return toDto(compilation, confirmedRequests);
     }
 
     @Override
@@ -91,9 +83,8 @@ public CompilationDto save(NewCompilationDto newCompilationDto) {
         Compilation saved = compRepository.save(compilation);
 
         Map<Long, Long> confirmedRequests = getConfirmedRequests(events);
-        Map<Long, Long> views = getViews(events);
 
-        return toDto(saved, confirmedRequests, views);
+        return toDto(saved, confirmedRequests);
     }
 
     @Override
@@ -129,13 +120,11 @@ public CompilationDto update(long compId, UpdateCompilationRequest updateRequest
         Set<Event> actualEvents = updated.getEvents();
 
         Map<Long, Long> confirmedRequests = getConfirmedRequests(actualEvents);
-        Map<Long, Long> views = getViews(actualEvents);
 
-        return toDto(updated, confirmedRequests, views);
+        return toDto(updated, confirmedRequests);
     }
 
-    private CompilationDto toDto(
-            Compilation compilation, Map<Long, Long> confirmedRequests, Map<Long, Long> views) {
+    private CompilationDto toDto(Compilation compilation, Map<Long, Long> confirmedRequests) {
         List<EventShortDto> events =
                 compilation.getEvents().stream()
                         .map(
@@ -143,7 +132,7 @@ private CompilationDto toDto(
                                         EventMapper.mapToShortDto(
                                                 event,
                                                 confirmedRequests.getOrDefault(event.getId(), 0L),
-                                                views.get(event.getId())))
+                                                null))
                         .toList();
 
         return CompilationsMapper.mapToDto(compilation, events);
@@ -172,31 +161,4 @@ private Map<Long, Long> getConfirmedRequests(Set<Event> events) {
 
         return requestRepository.countConfirmedByEventIds(eventIds);
     }
-
-    private Map<Long, Long> getViews(Set<Event> events) {
-        if (events.isEmpty()) {
-            return Map.of();
-        }
-
-        List<String> uris = events.stream().map(e -> "/events/%s".formatted(e.getId())).toList();
-
-        try {
-            List<ViewStatsDto> stats =
-                    statsClient.getStats(MINIMAL_LOCAL_DATE_TIME, LocalDateTime.now(), uris, true);
-
-            return stats.stream()
-                    .collect(
-                            Collectors.toMap(
-                                    s -> {
-                                        String uri = s.uri();
-                                        return Long.parseLong(
-                                                uri.substring(uri.lastIndexOf("/") + 1));
-                                    },
-                                    ViewStatsDto::hits));
-
-        } catch (Exception e) {
-            log.error("Error during getting stats for events", e);
-            return Map.of();
-        }
-    }
 }
diff --git a/main-service/src/main/java/ru/practicum/event/controller/EventAdminController.java b/main-service/src/main/java/ru/practicum/event/controller/EventAdminController.java
index 31fd7e7..c0760d6 100644
--- a/main-service/src/main/java/ru/practicum/event/controller/EventAdminController.java
+++ b/main-service/src/main/java/ru/practicum/event/controller/EventAdminController.java
@@ -5,6 +5,8 @@
 import java.util.List;
 
 import jakarta.validation.Valid;
+import jakarta.validation.constraints.Positive;
+import jakarta.validation.constraints.PositiveOrZero;
 
 import ru.practicum.event.dto.EventFullDto;
 import ru.practicum.event.dto.UpdateEventAdminRequest;
@@ -12,12 +14,14 @@
 import ru.practicum.event.service.EventService;
 import ru.practicum.event.service.EventsAdminGetRequest;
 
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
+@Validated
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/admin/events")
@@ -31,8 +35,8 @@ public Collection<EventFullDto> getEventsFiltered(
             @RequestParam(required = false) List<Long> categories,
             @RequestParam(required = false) LocalDateTime rangeStart,
             @RequestParam(required = false) LocalDateTime rangeEnd,
-            @RequestParam(defaultValue = "0") int from,
-            @RequestParam(defaultValue = "10") int size) {
+            @RequestParam(defaultValue = "0") @PositiveOrZero int from,
+            @RequestParam(defaultValue = "10") @Positive int size) {
         EventsAdminGetRequest getRequest =
                 new EventsAdminGetRequest(
                         users, states, categories, rangeStart, rangeEnd, from, size);
diff --git a/main-service/src/main/java/ru/practicum/event/controller/EventPrivateController.java b/main-service/src/main/java/ru/practicum/event/controller/EventPrivateController.java
index d0c0976..aee1200 100644
--- a/main-service/src/main/java/ru/practicum/event/controller/EventPrivateController.java
+++ b/main-service/src/main/java/ru/practicum/event/controller/EventPrivateController.java
@@ -3,6 +3,8 @@
 import java.util.Collection;
 
 import jakarta.validation.Valid;
+import jakarta.validation.constraints.Positive;
+import jakarta.validation.constraints.PositiveOrZero;
 
 import ru.practicum.event.dto.EventFullDto;
 import ru.practicum.event.dto.EventShortDto;
@@ -12,12 +14,14 @@
 import ru.practicum.event.service.EventsPrivateGetRequest;
 
 import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
+@Validated
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/users/{userId}/events")
@@ -27,8 +31,8 @@ public class EventPrivateController {
     @GetMapping()
     public Collection<EventShortDto> getEventsOfUserPaged(
             @PathVariable Long userId,
-            @RequestParam(defaultValue = "0") int from,
-            @RequestParam(defaultValue = "10") int size) {
+            @RequestParam(defaultValue = "0") @PositiveOrZero int from,
+            @RequestParam(defaultValue = "10") @Positive int size) {
         EventsPrivateGetRequest getRequest = new EventsPrivateGetRequest(userId, from, size);
         log.info("Private get events requested with params= {}", getRequest);
         return eventService.getEvents(getRequest);
diff --git a/main-service/src/main/java/ru/practicum/event/controller/EventPublicController.java b/main-service/src/main/java/ru/practicum/event/controller/EventPublicController.java
index 8501170..2f4d5ee 100644
--- a/main-service/src/main/java/ru/practicum/event/controller/EventPublicController.java
+++ b/main-service/src/main/java/ru/practicum/event/controller/EventPublicController.java
@@ -5,6 +5,8 @@
 import java.util.List;
 
 import jakarta.servlet.http.HttpServletRequest;
+import jakarta.validation.constraints.Positive;
+import jakarta.validation.constraints.PositiveOrZero;
 
 import ru.practicum.event.dto.EventFullDto;
 import ru.practicum.event.dto.EventShortDto;
@@ -12,12 +14,14 @@
 import ru.practicum.event.service.EventsPublicGetRequest;
 import ru.practicum.exception.ValidationException;
 
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
+@Validated
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/events")
@@ -33,8 +37,8 @@ public Collection<EventShortDto> getEventsFiltered(
             @RequestParam(required = false) LocalDateTime rangeEnd,
             @RequestParam(defaultValue = "false") boolean onlyAvailable,
             @RequestParam(required = false) EventSortBy sort,
-            @RequestParam(defaultValue = "0") int from,
-            @RequestParam(defaultValue = "10") int size,
+            @RequestParam(defaultValue = "0") @PositiveOrZero int from,
+            @RequestParam(defaultValue = "10") @Positive int size,
             HttpServletRequest request) {
         EventsPublicGetRequest getRequest =
                 new EventsPublicGetRequest(
diff --git a/main-service/src/main/java/ru/practicum/event/service/EventServiceImpl.java b/main-service/src/main/java/ru/practicum/event/service/EventServiceImpl.java
index b19d9db..246a538 100644
--- a/main-service/src/main/java/ru/practicum/event/service/EventServiceImpl.java
+++ b/main-service/src/main/java/ru/practicum/event/service/EventServiceImpl.java
@@ -30,6 +30,7 @@
 import org.springframework.data.domain.Page;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.client.RestClientException;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
@@ -40,8 +41,6 @@
 @Transactional(readOnly = true)
 public class EventServiceImpl implements EventService {
     private static final Duration MIN_TIME_BEFORE_EVENT = Duration.ofHours(2);
-    private static final LocalDateTime MINIMAL_LOCAL_DATE_TIME =
-            LocalDateTime.of(1000, 1, 1, 0, 0, 0);
     private static final String EVENTS_URI = "/events/%d";
     private final EventRepository eventRepository;
     private final UserRepository userRepository;
@@ -238,9 +237,19 @@ public EventFullDto updateEventByUser(
     }
 
     private Map<Long, Long> getStatsMapForEvents(Page<Event> events) {
+        if (events.isEmpty()) {
+            return Collections.emptyMap();
+        }
         List<String> listOfUris =
                 events.stream().map(event -> EVENTS_URI.formatted(event.getId())).toList();
-        return getStatsForEvents(listOfUris).stream()
+        LocalDateTime minimalPublishDate =
+                events.stream()
+                        .map(Event::getPublishedOn)
+                        .filter(Objects::nonNull)
+                        .min(LocalDateTime::compareTo)
+                        .orElse(LocalDateTime.of(1000, 1, 1, 1, 1));
+
+        return getStatsForEvents(listOfUris, minimalPublishDate).stream()
                 .collect(
                         Collectors.toMap(
                                 statsDto ->
@@ -262,30 +271,30 @@ private Map<Long, Long> getConfirmedRequests(Set<Event> events) {
         return requestRepository.countConfirmedByEventIds(eventIds);
     }
 
-    private List<ViewStatsDto> getStatsForEvents(List<String> uris) {
+    private List<ViewStatsDto> getStatsForEvents(List<String> uris, LocalDateTime startDate) {
         try {
-            return statsClient.getStats(MINIMAL_LOCAL_DATE_TIME, LocalDateTime.now(), uris, true);
-        } catch (Exception e) {
+            return statsClient.getStats(startDate, LocalDateTime.now(), uris, true);
+        } catch (RestClientException e) {
             log.error("Error during getting stats for events", e);
         }
         return List.of();
     }
 
     private ViewStatsDto getStatsForEvent(Event event, String uri) {
+        if (event.getPublishedOn() == null) {
+            return new ViewStatsDto(null, null, null);
+        }
+
+        LocalDateTime startDate = event.getPublishedOn().minusSeconds(10);
+        LocalDateTime endDate = LocalDateTime.now().plusSeconds(10);
         ViewStatsDto statsDto;
+
         try {
-            statsDto =
-                    statsClient
-                            .getStats(
-                                    MINIMAL_LOCAL_DATE_TIME,
-                                    LocalDateTime.now(),
-                                    List.of(uri),
-                                    true)
-                            .getFirst();
+            statsDto = statsClient.getStats(startDate, endDate, List.of(uri), true).getFirst();
         } catch (NoSuchElementException e) {
             log.trace("No stats for event with id={} found", event.getId());
             statsDto = new ViewStatsDto(null, null, 0L);
-        } catch (Exception e) {
+        } catch (RestClientException e) {
             log.error("Error during getting stats for event with id={}", event.getId(), e);
             statsDto = new ViewStatsDto(null, null, null);
         }
diff --git a/main-service/src/main/java/ru/practicum/user/controller/UserAdminController.java b/main-service/src/main/java/ru/practicum/user/controller/UserAdminController.java
index f239a1e..b8c4699 100644
--- a/main-service/src/main/java/ru/practicum/user/controller/UserAdminController.java
+++ b/main-service/src/main/java/ru/practicum/user/controller/UserAdminController.java
@@ -4,6 +4,8 @@
 import java.util.List;
 
 import jakarta.validation.Valid;
+import jakarta.validation.constraints.Positive;
+import jakarta.validation.constraints.PositiveOrZero;
 
 import ru.practicum.user.dto.NewUserRequest;
 import ru.practicum.user.dto.UserDto;
@@ -11,12 +13,14 @@
 import ru.practicum.user.service.UsersGetRequest;
 
 import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
 import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
 
 @Slf4j
+@Validated
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/admin/users")
@@ -26,8 +30,8 @@ public class UserAdminController {
     @GetMapping()
     public Collection<UserDto> getUsersPaged(
             @RequestParam(required = false) List<Long> ids,
-            @RequestParam(defaultValue = "0") int from,
-            @RequestParam(defaultValue = "10") int size) {
+            @RequestParam(defaultValue = "0") @PositiveOrZero int from,
+            @RequestParam(defaultValue = "10") @Positive int size) {
         log.info("Get users requested with ids={} from={} size={}", ids, from, size);
         UsersGetRequest request = new UsersGetRequest(from, size, ids);
         return userService.getUsersPaged(request);