fix(dolt): parse timestamps from TEXT columns instead of direct time.Time scan

The Dolt storage was scanning created_at and updated_at directly into
time.Time fields, but SQLite stores these as TEXT strings. The Go SQLite
driver cannot automatically convert TEXT to time.Time.

Added parseTimeString() helper and fixed all scan functions:
- issues.go: scanIssue()
- dependencies.go: scanIssueRow()
- history.go: GetIssueHistory(), GetIssueAsOf()
- transaction.go: scanIssueTx()

Fixes bd-4dqmy

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/storage/dolt/dependencies.go

@@ -523,6 +523,7 @@ func (s *DoltStore) GetIssuesByIDs(ctx context.Context, ids []string) ([]*types.
 // scanIssueRow scans a single issue from a rows result
 func scanIssueRow(rows *sql.Rows) (*types.Issue, error) {
 	var issue types.Issue
+	var createdAtStr, updatedAtStr sql.NullString // TEXT columns - must parse manually
 	var closedAt, compactedAt, deletedAt, lastActivity, dueAt, deferUntil sql.NullTime
 	var estimatedMinutes, originalSize, timeoutNs sql.NullInt64
 	var assignee, externalRef, compactedAtCommit, owner sql.NullString
@@ -538,7 +539,7 @@ func scanIssueRow(rows *sql.Rows) (*types.Issue, error) {
 		&issue.ID, &contentHash, &issue.Title, &issue.Description, &issue.Design,
 		&issue.AcceptanceCriteria, &issue.Notes, &issue.Status,
 		&issue.Priority, &issue.IssueType, &assignee, &estimatedMinutes,
-		&issue.CreatedAt, &issue.CreatedBy, &owner, &issue.UpdatedAt, &closedAt, &externalRef,
+		&createdAtStr, &issue.CreatedBy, &owner, &updatedAtStr, &closedAt, &externalRef,
 		&issue.CompactionLevel, &compactedAt, &compactedAtCommit, &originalSize, &sourceRepo, &closeReason,
 		&deletedAt, &deletedBy, &deleteReason, &originalType,
 		&sender, &ephemeral, &pinned, &isTemplate, &crystallizes,
@@ -551,6 +552,14 @@ func scanIssueRow(rows *sql.Rows) (*types.Issue, error) {
 		return nil, fmt.Errorf("failed to scan issue row: %w", err)
 	}
 
+	// Parse timestamp strings (TEXT columns require manual parsing)
+	if createdAtStr.Valid {
+		issue.CreatedAt = parseTimeString(createdAtStr.String)
+	}
+	if updatedAtStr.Valid {
+		issue.UpdatedAt = parseTimeString(updatedAtStr.String)
+	}
+
 	// Map nullable fields
 	if contentHash.Valid {
 		issue.ContentHash = contentHash.String

internal/storage/dolt/history.go

@@ -74,6 +74,7 @@ func (s *DoltStore) GetIssueHistory(ctx context.Context, issueID string) ([]*Iss
 	for rows.Next() {
 		var h IssueHistory
 		var issue types.Issue
+		var createdAtStr, updatedAtStr sql.NullString // TEXT columns - must parse manually
 		var closedAt sql.NullTime
 		var assignee, owner, createdBy, closeReason, molType sql.NullString
 		var estimatedMinutes sql.NullInt64
@@ -82,13 +83,21 @@ func (s *DoltStore) GetIssueHistory(ctx context.Context, issueID string) ([]*Iss
 		if err := rows.Scan(
 			&issue.ID, &issue.Title, &issue.Description, &issue.Design, &issue.AcceptanceCriteria, &issue.Notes,
 			&issue.Status, &issue.Priority, &issue.IssueType, &assignee, &owner, &createdBy,
-			&estimatedMinutes, &issue.CreatedAt, &issue.UpdatedAt, &closedAt, &closeReason,
+			&estimatedMinutes, &createdAtStr, &updatedAtStr, &closedAt, &closeReason,
 			&pinned, &molType,
 			&h.CommitHash, &h.Committer, &h.CommitDate,
 		); err != nil {
 			return nil, fmt.Errorf("failed to scan history: %w", err)
 		}
 
+		// Parse timestamp strings (TEXT columns require manual parsing)
+		if createdAtStr.Valid {
+			issue.CreatedAt = parseTimeString(createdAtStr.String)
+		}
+		if updatedAtStr.Valid {
+			issue.UpdatedAt = parseTimeString(updatedAtStr.String)
+		}
+
 		if closedAt.Valid {
 			issue.ClosedAt = &closedAt.Time
 		}
@@ -130,6 +139,7 @@ func (s *DoltStore) GetIssueAsOf(ctx context.Context, issueID string, ref string
 	}
 
 	var issue types.Issue
+	var createdAtStr, updatedAtStr sql.NullString // TEXT columns - must parse manually
 	var closedAt sql.NullTime
 	var assignee, owner, contentHash sql.NullString
 	var estimatedMinutes sql.NullInt64
@@ -144,7 +154,7 @@ func (s *DoltStore) GetIssueAsOf(ctx context.Context, issueID string, ref string
 
 	err := s.db.QueryRowContext(ctx, query, issueID).Scan(
 		&issue.ID, &contentHash, &issue.Title, &issue.Description, &issue.Status, &issue.Priority, &issue.IssueType, &assignee, &estimatedMinutes,
-		&issue.CreatedAt, &issue.CreatedBy, &owner, &issue.UpdatedAt, &closedAt,
+		&createdAtStr, &issue.CreatedBy, &owner, &updatedAtStr, &closedAt,
 	)
 
 	if err == sql.ErrNoRows {
@@ -154,6 +164,14 @@ func (s *DoltStore) GetIssueAsOf(ctx context.Context, issueID string, ref string
 		return nil, fmt.Errorf("failed to get issue as of %s: %w", ref, err)
 	}
 
+	// Parse timestamp strings (TEXT columns require manual parsing)
+	if createdAtStr.Valid {
+		issue.CreatedAt = parseTimeString(createdAtStr.String)
+	}
+	if updatedAtStr.Valid {
+		issue.UpdatedAt = parseTimeString(updatedAtStr.String)
+	}
+
 	if contentHash.Valid {
 		issue.ContentHash = contentHash.String
 	}

internal/storage/dolt/issues.go

@@ -410,6 +410,7 @@ func insertIssue(ctx context.Context, tx *sql.Tx, issue *types.Issue) error {
 
 func scanIssue(ctx context.Context, db *sql.DB, id string) (*types.Issue, error) {
 	var issue types.Issue
+	var createdAtStr, updatedAtStr sql.NullString // TEXT columns - must parse manually
 	var closedAt, compactedAt, deletedAt, lastActivity, dueAt, deferUntil sql.NullTime
 	var estimatedMinutes, originalSize, timeoutNs sql.NullInt64
 	var assignee, externalRef, compactedAtCommit, owner sql.NullString
@@ -439,7 +440,7 @@ func scanIssue(ctx context.Context, db *sql.DB, id string) (*types.Issue, error)
 		&issue.ID, &contentHash, &issue.Title, &issue.Description, &issue.Design,
 		&issue.AcceptanceCriteria, &issue.Notes, &issue.Status,
 		&issue.Priority, &issue.IssueType, &assignee, &estimatedMinutes,
-		&issue.CreatedAt, &issue.CreatedBy, &owner, &issue.UpdatedAt, &closedAt, &externalRef,
+		&createdAtStr, &issue.CreatedBy, &owner, &updatedAtStr, &closedAt, &externalRef,
 		&issue.CompactionLevel, &compactedAt, &compactedAtCommit, &originalSize, &sourceRepo, &closeReason,
 		&deletedAt, &deletedBy, &deleteReason, &originalType,
 		&sender, &ephemeral, &pinned, &isTemplate, &crystallizes,
@@ -457,6 +458,14 @@ func scanIssue(ctx context.Context, db *sql.DB, id string) (*types.Issue, error)
 		return nil, fmt.Errorf("failed to get issue: %w", err)
 	}
 
+	// Parse timestamp strings (TEXT columns require manual parsing)
+	if createdAtStr.Valid {
+		issue.CreatedAt = parseTimeString(createdAtStr.String)
+	}
+	if updatedAtStr.Valid {
+		issue.UpdatedAt = parseTimeString(updatedAtStr.String)
+	}
+
 	// Map nullable fields
 	if contentHash.Valid {
 		issue.ContentHash = contentHash.String

internal/storage/dolt/transaction.go

@@ -376,6 +376,7 @@ func insertIssueTx(ctx context.Context, tx *sql.Tx, issue *types.Issue) error {
 
 func scanIssueTx(ctx context.Context, tx *sql.Tx, id string) (*types.Issue, error) {
 	var issue types.Issue
+	var createdAtStr, updatedAtStr sql.NullString // TEXT columns - must parse manually
 	var closedAt sql.NullTime
 	var estimatedMinutes sql.NullInt64
 	var assignee, owner, contentHash sql.NullString
@@ -392,7 +393,7 @@ func scanIssueTx(ctx context.Context, tx *sql.Tx, id string) (*types.Issue, erro
 		&issue.ID, &contentHash, &issue.Title, &issue.Description, &issue.Design,
 		&issue.AcceptanceCriteria, &issue.Notes, &issue.Status,
 		&issue.Priority, &issue.IssueType, &assignee, &estimatedMinutes,
-		&issue.CreatedAt, &issue.CreatedBy, &owner, &issue.UpdatedAt, &closedAt,
+		&createdAtStr, &issue.CreatedBy, &owner, &updatedAtStr, &closedAt,
 		&ephemeral, &pinned, &isTemplate, &crystallizes,
 	)
 
@@ -403,6 +404,14 @@ func scanIssueTx(ctx context.Context, tx *sql.Tx, id string) (*types.Issue, erro
 		return nil, err
 	}
 
+	// Parse timestamp strings (TEXT columns require manual parsing)
+	if createdAtStr.Valid {
+		issue.CreatedAt = parseTimeString(createdAtStr.String)
+	}
+	if updatedAtStr.Valid {
+		issue.UpdatedAt = parseTimeString(updatedAtStr.String)
+	}
+
 	if contentHash.Valid {
 		issue.ContentHash = contentHash.String
 	}

internal/storage/dolt/util.go

@@ -0,0 +1,38 @@
+package dolt
+
+import (
+	"database/sql"
+	"time"
+)
+
+// parseTimeString parses a time string from database TEXT columns (non-nullable).
+// Used for required timestamp fields like created_at/updated_at when stored as TEXT.
+// Returns zero time if parsing fails, which maintains backwards compatibility.
+func parseTimeString(s string) time.Time {
+	if s == "" {
+		return time.Time{}
+	}
+	// Try RFC3339Nano first (more precise), then RFC3339, then SQLite format
+	for _, layout := range []string{time.RFC3339Nano, time.RFC3339, "2006-01-02 15:04:05"} {
+		if t, err := time.Parse(layout, s); err == nil {
+			return t
+		}
+	}
+	return time.Time{} // Unparseable - shouldn't happen with valid data
+}
+
+// parseNullableTimeString parses a nullable time string from database TEXT columns.
+// For columns declared as TEXT (not DATETIME), we must parse manually.
+// Supports RFC3339, RFC3339Nano, and SQLite's native format.
+func parseNullableTimeString(ns sql.NullString) *time.Time {
+	if !ns.Valid || ns.String == "" {
+		return nil
+	}
+	// Try RFC3339Nano first (more precise), then RFC3339, then SQLite format
+	for _, layout := range []string{time.RFC3339Nano, time.RFC3339, "2006-01-02 15:04:05"} {
+		if t, err := time.Parse(layout, ns.String); err == nil {
+			return &t
+		}
+	}
+	return nil // Unparseable - shouldn't happen with valid data
+}