fixed merge conflict

src/main/java/group/goforward/ballistic/controllers/admin/AdminCategoryController.java

@@ -0,0 +1,40 @@
+package group.goforward.ballistic.controllers.admin;
+
+import group.goforward.ballistic.model.PartCategory;
+import group.goforward.ballistic.repos.PartCategoryRepository;
+import group.goforward.ballistic.web.dto.admin.PartCategoryDto;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/admin/categories")
+@CrossOrigin
+public class AdminCategoryController {
+
+    private final PartCategoryRepository partCategories;
+
+    public AdminCategoryController(PartCategoryRepository partCategories) {
+        this.partCategories = partCategories;
+    }
+
+    @GetMapping
+    public List<PartCategoryDto> listCategories() {
+        return partCategories
+                .findAllByOrderByGroupNameAscSortOrderAscNameAsc()
+                .stream()
+                .map(this::toDto)
+                .toList();
+    }
+
+    private PartCategoryDto toDto(PartCategory entity) {
+        return new PartCategoryDto(
+                entity.getId(),
+                entity.getSlug(),
+                entity.getName(),
+                entity.getDescription(),
+                entity.getGroupName(),
+                entity.getSortOrder()
+        );
+    }
+}

src/main/java/group/goforward/ballistic/controllers/admin/AdminCategoryMappingController.java

@@ -0,0 +1,125 @@
+package group.goforward.ballistic.controllers.admin;
+
+import group.goforward.ballistic.model.AffiliateCategoryMap;
+import group.goforward.ballistic.model.PartCategory;
+import group.goforward.ballistic.repos.CategoryMappingRepository;
+import group.goforward.ballistic.repos.PartCategoryRepository;
+import group.goforward.ballistic.web.dto.admin.PartRoleMappingDto;
+import group.goforward.ballistic.web.dto.admin.PartRoleMappingRequest;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.server.ResponseStatusException;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/admin/category-mappings")
+@CrossOrigin
+public class AdminCategoryMappingController {
+
+    private final CategoryMappingRepository categoryMappingRepository;
+    private final PartCategoryRepository partCategoryRepository;
+
+    public AdminCategoryMappingController(
+            CategoryMappingRepository categoryMappingRepository,
+            PartCategoryRepository partCategoryRepository
+    ) {
+        this.categoryMappingRepository = categoryMappingRepository;
+        this.partCategoryRepository = partCategoryRepository;
+    }
+
+    // GET /api/admin/category-mappings?platform=AR-15
+    @GetMapping
+    public List<PartRoleMappingDto> list(
+            @RequestParam(name = "platform", defaultValue = "AR-15") String platform
+    ) {
+        List<AffiliateCategoryMap> mappings =
+                categoryMappingRepository.findBySourceTypeAndPlatformOrderById("PART_ROLE", platform);
+
+        return mappings.stream()
+                .map(this::toDto)
+                .toList();
+    }
+
+    // POST /api/admin/category-mappings
+    @PostMapping
+    public ResponseEntity<PartRoleMappingDto> create(
+            @RequestBody PartRoleMappingRequest request
+    ) {
+        if (request.platform() == null || request.partRole() == null || request.categorySlug() == null) {
+            throw new ResponseStatusException(HttpStatus.BAD_REQUEST, "platform, partRole, and categorySlug are required");
+        }
+
+        PartCategory category = partCategoryRepository.findBySlug(request.categorySlug())
+                .orElseThrow(() -> new ResponseStatusException(
+                        HttpStatus.BAD_REQUEST,
+                        "Unknown category slug: " + request.categorySlug()
+                ));
+
+        AffiliateCategoryMap mapping = new AffiliateCategoryMap();
+        mapping.setSourceType("PART_ROLE");
+        mapping.setSourceValue(request.partRole());
+        mapping.setPlatform(request.platform());
+        mapping.setPartCategory(category);
+        mapping.setNotes(request.notes());
+
+        AffiliateCategoryMap saved = categoryMappingRepository.save(mapping);
+
+        return ResponseEntity.status(HttpStatus.CREATED).body(toDto(saved));
+    }
+
+    // PUT /api/admin/category-mappings/{id}
+    @PutMapping("/{id}")
+    public PartRoleMappingDto update(
+            @PathVariable Integer id,
+            @RequestBody PartRoleMappingRequest request
+    ) {
+        AffiliateCategoryMap mapping = categoryMappingRepository.findById(id)
+                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND, "Mapping not found"));
+
+        if (request.platform() != null) {
+            mapping.setPlatform(request.platform());
+        }
+        if (request.partRole() != null) {
+            mapping.setSourceValue(request.partRole());
+        }
+        if (request.categorySlug() != null) {
+            PartCategory category = partCategoryRepository.findBySlug(request.categorySlug())
+                    .orElseThrow(() -> new ResponseStatusException(
+                            HttpStatus.BAD_REQUEST,
+                            "Unknown category slug: " + request.categorySlug()
+                    ));
+            mapping.setPartCategory(category);
+        }
+        if (request.notes() != null) {
+            mapping.setNotes(request.notes());
+        }
+
+        AffiliateCategoryMap saved = categoryMappingRepository.save(mapping);
+        return toDto(saved);
+    }
+
+    // DELETE /api/admin/category-mappings/{id}
+    @DeleteMapping("/{id}")
+    @ResponseStatus(HttpStatus.NO_CONTENT)
+    public void delete(@PathVariable Integer id) {
+        if (!categoryMappingRepository.existsById(id)) {
+            throw new ResponseStatusException(HttpStatus.NOT_FOUND, "Mapping not found");
+        }
+        categoryMappingRepository.deleteById(id);
+    }
+
+    private PartRoleMappingDto toDto(AffiliateCategoryMap map) {
+        PartCategory cat = map.getPartCategory();
+
+        return new PartRoleMappingDto(
+                map.getId(),
+                map.getPlatform(),
+                map.getSourceValue(),                 // partRole
+                cat != null ? cat.getSlug() : null,   // categorySlug
+                cat != null ? cat.getGroupName() : null,
+                map.getNotes()
+        );
+    }
+}

src/main/java/group/goforward/ballistic/controllers/admin/PartCategoryAdminController.java

@@ -0,0 +1,35 @@
+package group.goforward.ballistic.controllers.admin;
+
+import group.goforward.ballistic.model.PartCategory;
+import group.goforward.ballistic.repos.PartCategoryRepository;
+import group.goforward.ballistic.web.dto.admin.PartCategoryDto;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/api/admin/part-categories")
+@CrossOrigin // keep it loose for now, you can tighten origins later
+public class PartCategoryAdminController {
+
+    private final PartCategoryRepository partCategories;
+
+    public PartCategoryAdminController(PartCategoryRepository partCategories) {
+        this.partCategories = partCategories;
+    }
+
+    @GetMapping
+    public List<PartCategoryDto> list() {
+        return partCategories.findAllByOrderByGroupNameAscSortOrderAscNameAsc()
+                .stream()
+                .map(pc -> new PartCategoryDto(
+                        pc.getId(),
+                        pc.getSlug(),
+                        pc.getName(),
+                        pc.getDescription(),
+                        pc.getGroupName(),
+                        pc.getSortOrder()
+                ))
+                .toList();
+    }
+}

src/main/java/group/goforward/ballistic/model/AffiliateCategoryMap.java

@@ -5,23 +5,32 @@ import jakarta.persistence.*;
 @Entity
 @Table(name = "affiliate_category_map")
 public class AffiliateCategoryMap {
+
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
-    @Column(name = "id", nullable = false)
     private Integer id;
 
-    @Column(name = "feedname", nullable = false, length = 100)
-    private String feedname;
+    // e.g. "PART_ROLE", "RAW_CATEGORY", etc.
+    @Column(name = "source_type", nullable = false)
+    private String sourceType;
 
-    @Column(name = "affiliatecategory", nullable = false)
-    private String affiliatecategory;
+    // the value we’re mapping from (e.g. "suppressor", "TRIGGER")
+    @Column(name = "source_value", nullable = false)
+    private String sourceValue;
 
-    @Column(name = "buildercategoryid", nullable = false)
-    private Integer buildercategoryid;
+    // optional platform ("AR-15", "PRECISION", etc.)
+    @Column(name = "platform")
+    private String platform;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "part_category_id", nullable = false)
+    private PartCategory partCategory;
 
     @Column(name = "notes")
     private String notes;
 
+    // --- getters / setters ---
+
     public Integer getId() {
         return id;
     }
@@ -30,28 +39,36 @@ public class AffiliateCategoryMap {
         this.id = id;
     }
 
-    public String getFeedname() {
-        return feedname;
+    public String getSourceType() {
+        return sourceType;
     }
 
-    public void setFeedname(String feedname) {
-        this.feedname = feedname;
+    public void setSourceType(String sourceType) {
+        this.sourceType = sourceType;
     }
 
-    public String getAffiliatecategory() {
-        return affiliatecategory;
+    public String getSourceValue() {
+        return sourceValue;
     }
 
-    public void setAffiliatecategory(String affiliatecategory) {
-        this.affiliatecategory = affiliatecategory;
+    public void setSourceValue(String sourceValue) {
+        this.sourceValue = sourceValue;
     }
 
-    public Integer getBuildercategoryid() {
-        return buildercategoryid;
+    public String getPlatform() {
+        return platform;
     }
 
-    public void setBuildercategoryid(Integer buildercategoryid) {
-        this.buildercategoryid = buildercategoryid;
+    public void setPlatform(String platform) {
+        this.platform = platform;
+    }
+
+    public PartCategory getPartCategory() {
+        return partCategory;
+    }
+
+    public void setPartCategory(PartCategory partCategory) {
+        this.partCategory = partCategory;
     }
 
     public String getNotes() {
@@ -61,5 +78,4 @@ public class AffiliateCategoryMap {
     public void setNotes(String notes) {
         this.notes = notes;
     }
-
 }

src/main/java/group/goforward/ballistic/model/PartCategory.java

@@ -1,24 +1,49 @@
 package group.goforward.ballistic.model;
 
 import jakarta.persistence.*;
+import org.hibernate.annotations.ColumnDefault;
+
+import java.time.OffsetDateTime;
+import java.util.UUID;
 
 @Entity
 @Table(name = "part_categories")
 public class PartCategory {
+
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "id", nullable = false)
     private Integer id;
 
-    @Column(name = "slug", nullable = false, length = Integer.MAX_VALUE)
+    @Column(name = "slug", nullable = false, unique = true)
     private String slug;
 
-    @Column(name = "name", nullable = false, length = Integer.MAX_VALUE)
+    @Column(name = "name", nullable = false)
     private String name;
 
-    @Column(name = "description", length = Integer.MAX_VALUE)
+    @Column(name = "description")
     private String description;
 
+    @ColumnDefault("gen_random_uuid()")
+    @Column(name = "uuid", nullable = false)
+    private UUID uuid;
+
+    @Column(name = "group_name")
+    private String groupName;
+
+    @Column(name = "sort_order")
+    private Integer sortOrder;
+
+    @ColumnDefault("now()")
+    @Column(name = "created_at", nullable = false)
+    private OffsetDateTime createdAt;
+
+    @ColumnDefault("now()")
+    @Column(name = "updated_at", nullable = false)
+    private OffsetDateTime updatedAt;
+
+    // --- Getters & Setters ---
+
     public Integer getId() {
         return id;
     }
@@ -51,4 +76,43 @@ public class PartCategory {
         this.description = description;
     }
 
+    public UUID getUuid() {
+        return uuid;
+    }
+
+    public void setUuid(UUID uuid) {
+        this.uuid = uuid;
+    }
+
+    public String getGroupName() {
+        return groupName;
+    }
+
+    public void setGroupName(String groupName) {
+        this.groupName = groupName;
+    }
+
+    public Integer getSortOrder() {
+        return sortOrder;
+    }
+
+    public void setSortOrder(Integer sortOrder) {
+        this.sortOrder = sortOrder;
+    }
+
+    public OffsetDateTime getCreatedAt() {
+        return createdAt;
+    }
+
+    public void setCreatedAt(OffsetDateTime createdAt) {
+        this.createdAt = createdAt;
+    }
+
+    public OffsetDateTime getUpdatedAt() {
+        return updatedAt;
+    }
+
+    public void setUpdatedAt(OffsetDateTime updatedAt) {
+        this.updatedAt = updatedAt;
+    }
 }

src/main/java/group/goforward/ballistic/model/PartRoleCategoryMapping.java

@@ -0,0 +1,56 @@
+package group.goforward.ballistic.model;
+
+import jakarta.persistence.*;
+import java.time.OffsetDateTime;
+
+@Entity
+@Table(name = "part_role_category_mappings",
+       uniqueConstraints = @UniqueConstraint(columnNames = {"platform", "part_role"}))
+public class PartRoleCategoryMapping {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Integer id;
+
+    @Column(name = "platform", nullable = false)
+    private String platform;
+
+    @Column(name = "part_role", nullable = false)
+    private String partRole;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn(name = "category_slug", referencedColumnName = "slug", nullable = false)
+    private PartCategory category;
+
+    @Column(name = "notes")
+    private String notes;
+
+    @Column(name = "created_at", nullable = false)
+    private OffsetDateTime createdAt;
+
+    @Column(name = "updated_at", nullable = false)
+    private OffsetDateTime updatedAt;
+
+    // getters/setters…
+
+    public Integer getId() { return id; }
+    public void setId(Integer id) { this.id = id; }
+
+    public String getPlatform() { return platform; }
+    public void setPlatform(String platform) { this.platform = platform; }
+
+    public String getPartRole() { return partRole; }
+    public void setPartRole(String partRole) { this.partRole = partRole; }
+
+    public PartCategory getCategory() { return category; }
+    public void setCategory(PartCategory category) { this.category = category; }
+
+    public String getNotes() { return notes; }
+    public void setNotes(String notes) { this.notes = notes; }
+
+    public OffsetDateTime getCreatedAt() { return createdAt; }
+    public void setCreatedAt(OffsetDateTime createdAt) { this.createdAt = createdAt; }
+
+    public OffsetDateTime getUpdatedAt() { return updatedAt; }
+    public void setUpdatedAt(OffsetDateTime updatedAt) { this.updatedAt = updatedAt; }
+}

src/main/java/group/goforward/ballistic/model/Product.java

@@ -3,7 +3,13 @@ package group.goforward.ballistic.model;
 import jakarta.persistence.*;
 import java.time.Instant;
 import java.util.UUID;
+import java.math.BigDecimal;
+import java.util.Comparator;
+import java.util.Objects;
+import java.util.Set;
+import java.util.HashSet;
 
+import group.goforward.ballistic.model.ProductOffer;
 import group.goforward.ballistic.model.ProductConfiguration;
 
 @Entity
@@ -68,7 +74,16 @@ public class Product {
     @Column(name = "platform_locked", nullable = false)
     private Boolean platformLocked = false;
 
-    
+    @OneToMany(mappedBy = "product", fetch = FetchType.LAZY)
+    private Set<ProductOffer> offers = new HashSet<>();
+
+    public Set<ProductOffer> getOffers() {
+        return offers;
+    }
+
+    public void setOffers(Set<ProductOffer> offers) {
+        this.offers = offers;
+    }
 
     // --- lifecycle hooks ---
 
@@ -236,4 +251,41 @@ public class Product {
     public void setConfiguration(ProductConfiguration configuration) {
         this.configuration = configuration;
     }
+    // Convenience: best offer price for Gunbuilder
+public BigDecimal getBestOfferPrice() {
+    if (offers == null || offers.isEmpty()) {
+        return BigDecimal.ZERO;
+    }
+
+    return offers.stream()
+            // pick sale_price if present, otherwise retail_price
+            .map(offer -> {
+                if (offer.getSalePrice() != null) {
+                    return offer.getSalePrice();
+                }
+                return offer.getRetailPrice();
+            })
+            .filter(Objects::nonNull)
+            .min(BigDecimal::compareTo)
+            .orElse(BigDecimal.ZERO);
+}
+
+    // Convenience: URL for the best-priced offer
+    public String getBestOfferBuyUrl() {
+        if (offers == null || offers.isEmpty()) {
+            return null;
+        }
+
+        return offers.stream()
+                .sorted(Comparator.comparing(offer -> {
+                    if (offer.getSalePrice() != null) {
+                        return offer.getSalePrice();
+                    }
+                    return offer.getRetailPrice();
+                }, Comparator.nullsLast(BigDecimal::compareTo)))
+                .map(ProductOffer::getAffiliateUrl)
+                .filter(Objects::nonNull)
+                .findFirst()
+                .orElse(null);
+    }
 }

src/main/java/group/goforward/ballistic/model/ProductOffer.java

@@ -7,11 +7,11 @@ import org.hibernate.annotations.OnDeleteAction;
 
 import java.math.BigDecimal;
 import java.time.OffsetDateTime;
-import java.util.UUID;
 
 @Entity
 @Table(name = "product_offers")
 public class ProductOffer {
+
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     @Column(name = "id", nullable = false)
@@ -26,16 +26,16 @@ public class ProductOffer {
     @JoinColumn(name = "merchant_id", nullable = false)
     private Merchant merchant;
 
-    @Column(name = "avantlink_product_id", nullable = false, length = Integer.MAX_VALUE)
+    @Column(name = "avantlink_product_id", nullable = false)
     private String avantlinkProductId;
 
-    @Column(name = "sku", length = Integer.MAX_VALUE)
+    @Column(name = "sku")
     private String sku;
 
-    @Column(name = "upc", length = Integer.MAX_VALUE)
+    @Column(name = "upc")
     private String upc;
 
-    @Column(name = "buy_url", nullable = false, length = Integer.MAX_VALUE)
+    @Column(name = "buy_url", nullable = false)
     private String buyUrl;
 
     @Column(name = "price", nullable = false, precision = 10, scale = 2)
@@ -45,7 +45,7 @@ public class ProductOffer {
     private BigDecimal originalPrice;
 
     @ColumnDefault("'USD'")
-    @Column(name = "currency", nullable = false, length = Integer.MAX_VALUE)
+    @Column(name = "currency", nullable = false)
     private String currency;
 
     @ColumnDefault("true")
@@ -60,6 +60,10 @@ public class ProductOffer {
     @Column(name = "first_seen_at", nullable = false)
     private OffsetDateTime firstSeenAt;
 
+    // -----------------------------------------------------
+    // Getters & setters
+    // -----------------------------------------------------
+
     public Integer getId() {
         return id;
     }
@@ -164,14 +168,26 @@ public class ProductOffer {
         this.firstSeenAt = firstSeenAt;
     }
 
+    // -----------------------------------------------------
+    // Helper Methods (used by Product entity)
+    // -----------------------------------------------------
+
+    public BigDecimal getSalePrice() {
+        return price;
+    }
+
+    public BigDecimal getRetailPrice() {
+        return originalPrice != null ? originalPrice : price;
+    }
+
+    public String getAffiliateUrl() {
+        return buyUrl;
+    }
+
     public BigDecimal getEffectivePrice() {
-        // Prefer a true sale price when it's lower than the original
         if (price != null && originalPrice != null && price.compareTo(originalPrice) < 0) {
             return price;
         }
-    
-        // Otherwise, use whatever is available
         return price != null ? price : originalPrice;
     }
-
 }

src/main/java/group/goforward/ballistic/repos/CategoryMappingRepository.java

@@ -1,7 +1,29 @@
-package group.goforward.ballistic.repos;
-
-import group.goforward.ballistic.model.AffiliateCategoryMap;
-import org.springframework.data.jpa.repository.JpaRepository;
-
-public interface CategoryMappingRepository extends JpaRepository<AffiliateCategoryMap, Integer> {
+package group.goforward.ballistic.repos;
+
+import group.goforward.ballistic.model.AffiliateCategoryMap;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface CategoryMappingRepository extends JpaRepository<AffiliateCategoryMap, Integer> {
+
+    // Match by source_type + source_value + platform (case-insensitive)
+    Optional<AffiliateCategoryMap> findBySourceTypeAndSourceValueAndPlatformIgnoreCase(
+            String sourceType,
+            String sourceValue,
+            String platform
+    );
+
+    // Fallback: match by source_type + source_value when platform is null/ignored
+    Optional<AffiliateCategoryMap> findBySourceTypeAndSourceValueIgnoreCase(
+            String sourceType,
+            String sourceValue
+    );
+
+    // Used by AdminCategoryMappingController: list mappings for a given source_type + platform
+    List<AffiliateCategoryMap> findBySourceTypeAndPlatformOrderById(
+            String sourceType,
+            String platform
+    );
 }

src/main/java/group/goforward/ballistic/repos/PartCategoryRepository.java

@@ -1,9 +1,14 @@
-package group.goforward.ballistic.repos;
-
-import group.goforward.ballistic.model.PartCategory;
-import org.springframework.data.jpa.repository.JpaRepository;
-import java.util.Optional;
-
-public interface PartCategoryRepository extends JpaRepository<PartCategory, Integer> {
-    Optional<PartCategory> findBySlug(String slug);
+package group.goforward.ballistic.repos;
+
+import group.goforward.ballistic.model.PartCategory;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface PartCategoryRepository extends JpaRepository<PartCategory, Integer> {
+
+    Optional<PartCategory> findBySlug(String slug);
+
+    List<PartCategory> findAllByOrderByGroupNameAscSortOrderAscNameAsc();
 }

src/main/java/group/goforward/ballistic/repos/PartRoleCategoryMappingRepository.java

@@ -0,0 +1,14 @@
+package group.goforward.ballistic.repos;
+
+import group.goforward.ballistic.model.PartRoleCategoryMapping;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.List;
+import java.util.Optional;
+
+public interface PartRoleCategoryMappingRepository extends JpaRepository<PartRoleCategoryMapping, Integer> {
+
+    List<PartRoleCategoryMapping> findAllByPlatformOrderByPartRoleAsc(String platform);
+
+    Optional<PartRoleCategoryMapping> findByPlatformAndPartRole(String platform, String partRole);
+}

src/main/java/group/goforward/ballistic/repos/ProductRepository.java

@@ -1,53 +1,62 @@
-package group.goforward.ballistic.repos;
-
-import group.goforward.ballistic.model.Product;
-import group.goforward.ballistic.model.Brand;
-import org.springframework.data.jpa.repository.JpaRepository;
-import org.springframework.data.jpa.repository.Query;
-import org.springframework.data.repository.query.Param;
-
-import java.util.Optional;
-import java.util.UUID;
-import java.util.List;
-import java.util.Collection;
-
-public interface ProductRepository extends JpaRepository<Product, Integer> {
-
-    Optional<Product> findByUuid(UUID uuid);
-
-    boolean existsBySlug(String slug);
-
-    List<Product> findAllByBrandAndMpn(Brand brand, String mpn);
-
-    List<Product> findAllByBrandAndUpc(Brand brand, String upc);
-
-    // All products for a given platform (e.g. "AR-15")
-    List<Product> findByPlatform(String platform);
-
-    // Products filtered by platform + part roles (e.g. upper-receiver, barrel, etc.)
-    List<Product> findByPlatformAndPartRoleIn(String platform, Collection<String> partRoles);
-
-    // ---------- Optimized variants for Gunbuilder (fetch brand to avoid N+1) ----------
-
-    @Query("""
-           SELECT p
-           FROM Product p
-           JOIN FETCH p.brand b
-           WHERE p.platform = :platform
-             AND p.deletedAt IS NULL
-           """)
-    List<Product> findByPlatformWithBrand(@Param("platform") String platform);
-
-    @Query("""
-           SELECT p
-           FROM Product p
-           JOIN FETCH p.brand b
-           WHERE p.platform = :platform
-             AND p.partRole IN :partRoles
-             AND p.deletedAt IS NULL
-           """)
-    List<Product> findByPlatformAndPartRoleInWithBrand(
-            @Param("platform") String platform,
-            @Param("partRoles") Collection<String> partRoles
-    );
+package group.goforward.ballistic.repos;
+
+import group.goforward.ballistic.model.Brand;
+import group.goforward.ballistic.model.Product;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.List;
+
+public interface ProductRepository extends JpaRepository<Product, Integer> {
+
+    // -------------------------------------------------
+    // Used by MerchantFeedImportServiceImpl
+    // -------------------------------------------------
+
+    List<Product> findAllByBrandAndMpn(Brand brand, String mpn);
+
+    List<Product> findAllByBrandAndUpc(Brand brand, String upc);
+
+    boolean existsBySlug(String slug);
+
+    // -------------------------------------------------
+    // Used by ProductController for platform views
+    // -------------------------------------------------
+
+    @Query("""
+           SELECT p
+           FROM Product p
+           JOIN FETCH p.brand b
+           WHERE p.platform = :platform
+             AND p.deletedAt IS NULL
+           """)
+    List<Product> findByPlatformWithBrand(@Param("platform") String platform);
+
+    @Query("""
+           SELECT p
+           FROM Product p
+           JOIN FETCH p.brand b
+           WHERE p.platform = :platform
+             AND p.partRole IN :roles
+             AND p.deletedAt IS NULL
+           """)
+    List<Product> findByPlatformAndPartRoleInWithBrand(
+            @Param("platform") String platform,
+            @Param("roles") List<String> roles
+    );
+
+    // -------------------------------------------------
+    // Used by Gunbuilder service (if you wired this)
+    // -------------------------------------------------
+
+    @Query("""
+           SELECT DISTINCT p
+           FROM Product p
+           LEFT JOIN FETCH p.brand b
+           LEFT JOIN FETCH p.offers o
+           WHERE p.platform = :platform
+             AND p.deletedAt IS NULL
+           """)
+    List<Product> findSomethingForGunbuilder(@Param("platform") String platform);
 }

src/main/java/group/goforward/ballistic/services/GunbuilderProductService.java

@@ -0,0 +1,57 @@
+package group.goforward.ballistic.services;
+
+import group.goforward.ballistic.model.PartCategory;
+import group.goforward.ballistic.model.Product;
+import group.goforward.ballistic.repos.ProductRepository;
+import group.goforward.ballistic.web.dto.GunbuilderProductDto;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class GunbuilderProductService {
+
+    private final ProductRepository productRepository;
+    private final PartCategoryResolverService partCategoryResolverService;
+
+    public GunbuilderProductService(
+            ProductRepository productRepository,
+            PartCategoryResolverService partCategoryResolverService
+    ) {
+        this.productRepository = productRepository;
+        this.partCategoryResolverService = partCategoryResolverService;
+    }
+
+    public List<GunbuilderProductDto> listGunbuilderProducts(String platform) {
+
+        List<Product> products = productRepository.findSomethingForGunbuilder(platform);
+
+        return products.stream()
+                .map(p -> {
+                    var maybeCategory = partCategoryResolverService
+                            .resolveForPlatformAndPartRole(platform, p.getPartRole());
+
+                    if (maybeCategory.isEmpty()) {
+                        // you can also log here
+                        return null;
+                    }
+
+                    PartCategory cat = maybeCategory.get();
+
+                    return new GunbuilderProductDto(
+                            p.getId(),
+                            p.getName(),
+                            p.getBrand().getName(),
+                            platform,
+                            p.getPartRole(),
+                            p.getBestOfferPrice(),
+                            p.getMainImageUrl(),
+                            p.getBestOfferBuyUrl(),
+                            cat.getSlug(),
+                            cat.getGroupName()
+                    );
+                })
+                .filter(dto -> dto != null)
+                .toList();
+    }
+}

src/main/java/group/goforward/ballistic/services/PartCategoryResolverService.java

@@ -0,0 +1,38 @@
+package group.goforward.ballistic.services;
+
+import group.goforward.ballistic.model.AffiliateCategoryMap;
+import group.goforward.ballistic.model.PartCategory;
+import group.goforward.ballistic.repos.CategoryMappingRepository;
+import org.springframework.stereotype.Service;
+
+import java.util.Optional;
+
+@Service
+public class PartCategoryResolverService {
+
+    private final CategoryMappingRepository categoryMappingRepository;
+
+    public PartCategoryResolverService(CategoryMappingRepository categoryMappingRepository) {
+        this.categoryMappingRepository = categoryMappingRepository;
+    }
+
+    /**
+     * Resolve a part category from a platform + partRole (what gunbuilder cares about).
+     * Returns Optional.empty() if we have no mapping yet.
+     */
+    public Optional<PartCategory> resolveForPlatformAndPartRole(String platform, String partRole) {
+        // sourceType is a convention – you can also enum this
+        String sourceType = "PART_ROLE";
+
+        // First try with platform
+        return categoryMappingRepository
+                .findBySourceTypeAndSourceValueAndPlatformIgnoreCase(sourceType, partRole, platform)
+                .map(AffiliateCategoryMap::getPartCategory)
+                // if that fails, fall back to ANY platform
+                .or(() ->
+                        categoryMappingRepository
+                            .findBySourceTypeAndSourceValueIgnoreCase(sourceType, partRole)
+                            .map(AffiliateCategoryMap::getPartCategory)
+                );
+    }
+}

src/main/java/group/goforward/ballistic/web/dto/GunbuilderProductDto.java

@@ -0,0 +1,53 @@
+package group.goforward.ballistic.web.dto;
+
+import java.math.BigDecimal;
+
+public class GunbuilderProductDto {
+
+    private Integer id;
+    private String name;
+    private String brand;
+    private String platform;
+    private String partRole;
+    private BigDecimal price;
+    private String imageUrl;
+    private String buyUrl;
+    private String categorySlug;
+    private String categoryGroup;
+
+    public GunbuilderProductDto(
+            Integer id,
+            String name,
+            String brand,
+            String platform,
+            String partRole,
+            BigDecimal price,
+            String imageUrl,
+            String buyUrl,
+            String categorySlug,
+            String categoryGroup
+    ) {
+        this.id = id;
+        this.name = name;
+        this.brand = brand;
+        this.platform = platform;
+        this.partRole = partRole;
+        this.price = price;
+        this.imageUrl = imageUrl;
+        this.buyUrl = buyUrl;
+        this.categorySlug = categorySlug;
+        this.categoryGroup = categoryGroup;
+    }
+
+    // --- Getters only (DTOs are read-only in most cases) ---
+    public Integer getId() { return id; }
+    public String getName() { return name; }
+    public String getBrand() { return brand; }
+    public String getPlatform() { return platform; }
+    public String getPartRole() { return partRole; }
+    public BigDecimal getPrice() { return price; }
+    public String getImageUrl() { return imageUrl; }
+    public String getBuyUrl() { return buyUrl; }
+    public String getCategorySlug() { return categorySlug; }
+    public String getCategoryGroup() { return categoryGroup; }
+}

src/main/java/group/goforward/ballistic/web/dto/admin/PartCategoryDto.java

@@ -0,0 +1,10 @@
+package group.goforward.ballistic.web.dto.admin;
+
+public record PartCategoryDto(
+        Integer id,
+        String slug,
+        String name,
+        String description,
+        String groupName,
+        Integer sortOrder
+) {}

src/main/java/group/goforward/ballistic/web/dto/admin/PartRoleMappingDto.java

@@ -0,0 +1,10 @@
+package group.goforward.ballistic.web.dto.admin;
+
+public record PartRoleMappingDto(
+        Integer id,
+        String platform,
+        String partRole,
+        String categorySlug,
+        String groupName,
+        String notes
+) {}

src/main/java/group/goforward/ballistic/web/dto/admin/PartRoleMappingRequest.java

@@ -0,0 +1,8 @@
+package group.goforward.ballistic.web.dto.admin;
+
+public record PartRoleMappingRequest(
+        String platform,
+        String partRole,
+        String categorySlug,
+        String notes
+) {}