Fix critical issues in WHOOSH Gitea issue monitoring and task creation

This commit resolves multiple blocking issues that were preventing WHOOSH from
properly detecting and converting bzzz-task labeled issues from Gitea:

## Issues Fixed:

1. **JSON Parsing Error**: Gitea API returns repository owner as string in issue
   responses, but code expected User object. Added IssueRepository struct to
   handle this API response format difference.

2. **Database Error Handling**: Code was using database/sql.ErrNoRows but
   system uses pgx driver. Updated imports and error constants to use
   pgx.ErrNoRows consistently.

3. **NULL Value Scanning**: Database fields (repository, project_id,
   estimated_hours, complexity_score) can be NULL but Go structs used
   non-pointer types. Added proper NULL handling with pointer scanning
   and safe conversion.

## Results:
- ✅ WHOOSH now successfully detects bzzz-task labeled issues
- ✅ Task creation pipeline working end-to-end
- ✅ Tasks API functioning properly
- ✅ First bzzz-task converted: "Logic around registered agents faulty"

The core issue monitoring workflow is now fully operational and ready for
CHORUS integration.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/gitea/client.go

@@ -34,7 +34,7 @@ type Issue struct {
 	ClosedAt    *time.Time      `json:"closed_at"`
 	HTMLURL     string          `json:"html_url"`
 	User        User            `json:"user"`
-	Repository  Repository `json:"repository,omitempty"`
+	Repository  IssueRepository `json:"repository,omitempty"`
 }
 
 // Label represents a Gitea issue label
@@ -68,6 +68,14 @@ type Repository struct {
 	Language    string `json:"language"`
 }
 
+// IssueRepository represents the simplified repository info in issue responses
+type IssueRepository struct {
+	ID       int64  `json:"id"`
+	Name     string `json:"name"`
+	FullName string `json:"full_name"`
+	Owner    string `json:"owner"` // Note: This is a string, not a User object
+}
+
 // NewClient creates a new Gitea API client
 func NewClient(cfg config.GITEAConfig) *Client {
 	token := cfg.Token
@@ -167,10 +175,10 @@ func (c *Client) GetIssues(ctx context.Context, owner, repo string, opts IssueLi
 	
 	// Set repository information on each issue for context
 	for i := range issues {
-		issues[i].Repository = Repository{
+		issues[i].Repository = IssueRepository{
 			Name:     repo,
 			FullName: fmt.Sprintf("%s/%s", owner, repo),
-			Owner:    User{Login: owner},
+			Owner:    owner, // Now a string instead of User object
 		}
 	}
 	
@@ -193,10 +201,10 @@ func (c *Client) GetIssue(ctx context.Context, owner, repo string, issueNumber i
 	}
 	
 	// Set repository information
-	issue.Repository = Repository{
+	issue.Repository = IssueRepository{
 		Name:     repo,
 		FullName: fmt.Sprintf("%s/%s", owner, repo),
-		Owner:    User{Login: owner},
+		Owner:    owner, // Now a string instead of User object
 	}
 	
 	return &issue, nil

internal/monitor/monitor.go

@@ -2,7 +2,6 @@ package monitor
 
 import (
 	"context"
-	"database/sql"
 	"encoding/json"
 	"fmt"
 	"strconv"
@@ -11,6 +10,7 @@ import (
 
 	"github.com/chorus-services/whoosh/internal/config"
 	"github.com/chorus-services/whoosh/internal/gitea"
+	"github.com/jackc/pgx/v5"
 	"github.com/jackc/pgx/v5/pgxpool"
 	"github.com/rs/zerolog/log"
 )
@@ -202,11 +202,14 @@ func (m *Monitor) syncRepository(ctx context.Context, repo RepositoryConfig) {
 // createOrUpdateTask creates a new task or updates an existing one from a Gitea issue
 func (m *Monitor) createOrUpdateTask(ctx context.Context, repo RepositoryConfig, issue gitea.Issue) (string, bool, error) {
 	// Check if task already exists
-	var existingTaskID sql.NullString
+	var existingTaskID string
 	query := `SELECT id FROM tasks WHERE external_id = $1 AND source_type = $2`
 	err := m.db.QueryRow(ctx, query, strconv.FormatInt(issue.Number, 10), repo.SourceType).Scan(&existingTaskID)
 	
-	if err != nil && err != sql.ErrNoRows {
+	taskExists := err == nil
+	
+	// Handle errors other than "no rows found"
+	if err != nil && err != pgx.ErrNoRows {
 		return "", false, fmt.Errorf("failed to check existing task: %w", err)
 	}
 	
@@ -230,8 +233,8 @@ func (m *Monitor) createOrUpdateTask(ctx context.Context, repo RepositoryConfig,
 	techStack := m.extractTechStackFromIssue(issue)
 	techStackJSON, _ := json.Marshal(techStack)
 	
-	if existingTaskID.Valid {
-		// Update existing task
+	if taskExists {
+		// Task exists - update it
 		updateQuery := `
 			UPDATE tasks SET
 				title = $1,
@@ -253,14 +256,14 @@ func (m *Monitor) createOrUpdateTask(ctx context.Context, repo RepositoryConfig,
 			labelsJSON,
 			techStackJSON,
 			issue.UpdatedAt,
-			existingTaskID.String,
+			existingTaskID,
 		)
 		
 		if err != nil {
 			return "", false, fmt.Errorf("failed to update task: %w", err)
 		}
 		
-		return existingTaskID.String, false, nil
+		return existingTaskID, false, nil
 	} else {
 		// Create new task
 		var taskID string
@@ -440,10 +443,10 @@ func (m *Monitor) getMonitoredRepositories(ctx context.Context) ([]RepositoryCon
 
 // updateRepositoryStatus updates the sync status of a repository
 func (m *Monitor) updateRepositoryStatus(ctx context.Context, repoID, status string, err error) error {
-	var errorMsg sql.NullString
+	var errorMsg *string
 	if err != nil {
-		errorMsg.String = err.Error()
-		errorMsg.Valid = true
+		errStr := err.Error()
+		errorMsg = &errStr
 	}
 	
 	query := `
@@ -555,7 +558,7 @@ func (m *Monitor) getRepositoryByID(ctx context.Context, repoID string) (*Reposi
 		&chorusLabelsJSON, &repo.LastSync, &repo.LastIssueSync, &repo.SyncStatus,
 	)
 	if err != nil {
-		if err == sql.ErrNoRows {
+		if err == pgx.ErrNoRows {
 			return nil, fmt.Errorf("repository not found: %s", repoID)
 		}
 		return nil, fmt.Errorf("failed to query repository: %w", err)

internal/tasks/service.go

@@ -354,13 +354,16 @@ func (s *Service) UpdateTaskStatus(ctx context.Context, update *TaskStatusUpdate
 func (s *Service) scanTask(scanner interface{ Scan(...interface{}) error }) (*Task, error) {
 	task := &Task{}
 	var sourceConfigJSON, labelsJSON, techStackJSON, requirementsJSON []byte
+	var repository, projectID *string
+	var estimatedHours *int
+	var complexityScore *float64
 	
 	err := scanner.Scan(
 		&task.ID, &task.ExternalID, &task.ExternalURL, &task.SourceType, &sourceConfigJSON,
 		&task.Title, &task.Description, &task.Status, &task.Priority,
 		&task.AssignedTeamID, &task.AssignedAgentID,
-		&task.Repository, &task.ProjectID, &labelsJSON, &techStackJSON, &requirementsJSON,
-		&task.EstimatedHours, &task.ComplexityScore,
+		&repository, &projectID, &labelsJSON, &techStackJSON, &requirementsJSON,
+		&estimatedHours, &complexityScore,
 		&task.ClaimedAt, &task.StartedAt, &task.CompletedAt,
 		&task.CreatedAt, &task.UpdatedAt, &task.ExternalCreatedAt, &task.ExternalUpdatedAt,
 	)
@@ -369,6 +372,20 @@ func (s *Service) scanTask(scanner interface{ Scan(...interface{}) error }) (*Ta
 		return nil, err
 	}
 	
+	// Handle nullable fields
+	if repository != nil {
+		task.Repository = *repository
+	}
+	if projectID != nil {
+		task.ProjectID = *projectID
+	}
+	if estimatedHours != nil {
+		task.EstimatedHours = *estimatedHours
+	}
+	if complexityScore != nil {
+		task.ComplexityScore = *complexityScore
+	}
+	
 	// Parse JSON fields
 	if len(sourceConfigJSON) > 0 {
 		json.Unmarshal(sourceConfigJSON, &task.SourceConfig)