Fix seed SQL execution to handle multiple statements

PostgreSQL prepared statements don't support multiple commands.
Split SQL file into individual statements and execute each one,
handling string literals and comment-only blocks properly.

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

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

internal/admin/handlers/settings_handler.go

@@ -4,6 +4,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"strings"
 
 	"github.com/gin-gonic/gin"
 	"gorm.io/gorm"
@@ -124,5 +125,80 @@ func (h *AdminSettingsHandler) runSeedFile(filename string) error {
 		return err
 	}
 
-	return h.db.Exec(string(sqlContent)).Error
+	// Split SQL into individual statements and execute each one
+	// This is needed because GORM/PostgreSQL prepared statements don't support multiple commands
+	statements := splitSQLStatements(string(sqlContent))
+
+	for _, stmt := range statements {
+		stmt = strings.TrimSpace(stmt)
+		if stmt == "" {
+			continue
+		}
+		if err := h.db.Exec(stmt).Error; err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// splitSQLStatements splits SQL content into individual statements
+func splitSQLStatements(sql string) []string {
+	var statements []string
+	var current strings.Builder
+	inString := false
+	stringChar := byte(0)
+
+	for i := 0; i < len(sql); i++ {
+		c := sql[i]
+
+		// Handle string literals (don't split on semicolons inside strings)
+		if (c == '\'' || c == '"') && (i == 0 || sql[i-1] != '\\') {
+			if !inString {
+				inString = true
+				stringChar = c
+			} else if c == stringChar {
+				// Check for escaped quote ('')
+				if c == '\'' && i+1 < len(sql) && sql[i+1] == '\'' {
+					current.WriteByte(c)
+					i++
+					current.WriteByte(sql[i])
+					continue
+				}
+				inString = false
+			}
+		}
+
+		// Split on semicolon if not in string
+		if c == ';' && !inString {
+			current.WriteByte(c)
+			stmt := strings.TrimSpace(current.String())
+			if stmt != "" && !isCommentOnly(stmt) {
+				statements = append(statements, stmt)
+			}
+			current.Reset()
+			continue
+		}
+
+		current.WriteByte(c)
+	}
+
+	// Don't forget the last statement if it doesn't end with semicolon
+	if stmt := strings.TrimSpace(current.String()); stmt != "" && !isCommentOnly(stmt) {
+		statements = append(statements, stmt)
+	}
+
+	return statements
+}
+
+// isCommentOnly checks if the statement is only comments
+func isCommentOnly(stmt string) bool {
+	lines := strings.Split(stmt, "\n")
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line != "" && !strings.HasPrefix(line, "--") {
+			return false
+		}
+	}
+	return true
 }