Add checks for the Indicator request endpoint

src/Managing.Api/Models/Requests/IndicatorRequestDto.cs

@@ -13,27 +13,33 @@ public class IndicatorRequestDto
     /// Name of the indicator (e.g., "MACD", "RSI", "Bollinger Bands")
     /// </summary>
     [Required]
-    public string IndicatorName { get; set; }
+    [StringLength(200, MinimumLength = 4, ErrorMessage = "Indicator name must be between 4 and 200 characters.")]
+    public string IndicatorName { get; set; } = string.Empty;
 
     /// <summary>
     /// Strategy or description of how the indicator is used (e.g., "MACD Cross", "RSI Divergence")
     /// </summary>
     [Required]
+    [StringLength(1000, MinimumLength = 10, ErrorMessage = "Strategy description must be between 10 and 1000 characters.")]
     public string StrategyDescription { get; set; } = string.Empty;
 
     /// <summary>
     /// Primary documentation URL for the indicator
     /// </summary>
+    [Url(ErrorMessage = "Documentation URL must be a valid URL.")]
     public string? DocumentationUrl { get; set; }
 
     /// <summary>
     /// Image URL for the indicator (optional) - can be a chart, diagram, or visual representation
     /// </summary>
+    [Url(ErrorMessage = "Image URL must be a valid URL.")]
     public string? ImageUrl { get; set; }
 
     /// <summary>
-    /// Name of the person requesting the indicator
+    /// Telegram account handle of the person requesting the indicator (e.g., "cryptooda")
     /// </summary>
     [Required]
+    [RegularExpression(@"^(?=(?:[0-9_]*[a-z]){3})[a-z0-9_]{5,}$", 
+        ErrorMessage = "Requester name must be a valid Telegram handle (lowercase letters, numbers, underscores only, minimum 5 characters with at least 3 letters).")]
     public string RequesterName { get; set; } = string.Empty;
 }

src/Managing.WebApp/src/generated/ManagingApi.ts

@@ -5103,11 +5103,11 @@ export interface PrivyInitAddressResponse {
 }
 
 export interface IndicatorRequestDto {
-    indicatorName?: string;
+    indicatorName: string;
-    strategyDescription?: string;
+    strategyDescription: string;
-    documentationUrl?: string;
+    documentationUrl?: string | null;
     imageUrl?: string | null;
-    requesterName?: string;
+    requesterName: string;
 }
 
 export interface LoginRequest {

src/Managing.WebApp/src/generated/ManagingApiTypes.ts

@@ -1234,11 +1234,11 @@ export interface PrivyInitAddressResponse {
 }
 
 export interface IndicatorRequestDto {
-    indicatorName?: string;
+    indicatorName: string;
-    strategyDescription?: string;
+    strategyDescription: string;
-    documentationUrl?: string;
+    documentationUrl?: string | null;
     imageUrl?: string | null;
-    requesterName?: string;
+    requesterName: string;
 }
 
 export interface LoginRequest {