fix: handle schema.sql file path in containerized environment

- Try multiple locations for schema.sql file
- Support both local dev and containerized deployment paths
- Add informative logging when schema is loaded
- Prevent runtime.Caller issues in containers

Locations checked:
- database/schema/schema.sql (working directory)
- /app/database/schema/schema.sql (container)
- ../database/schema/schema.sql (relative)
- ../../database/schema/schema.sql (relative)

This fixes the 'no such file or directory' error in production containers.

internal/database/schema.go

@@ -8,7 +8,6 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"runtime"
 	"strings"
 	"time"
 
@@ -18,15 +17,37 @@ import (
 var SchemaFile string
 
 func init() {
-	// Get the path to schema.sql relative to this file
-	_, currentFile, _, _ := runtime.Caller(0)
-	baseDir := filepath.Dir(currentFile)
-	schemaPath := filepath.Join(baseDir, "..", "..", "database", "schema", "schema.sql")
-
-	content, err := os.ReadFile(schemaPath)
-	if err != nil {
-		log.Fatalf("Failed to read schema.sql: %v", err)
+	// Try multiple locations for schema.sql
+	// 1. Relative to working directory (for local dev)
+	// 2. Relative to binary (for containerized deployment)
+	locations := []string{
+		"database/schema/schema.sql",
+		"/app/database/schema/schema.sql",
+		"../database/schema/schema.sql",
+		"../../database/schema/schema.sql",
 	}
+
+	var content []byte
+	var err error
+
+	for _, path := range locations {
+		content, err = os.ReadFile(path)
+		if err == nil {
+			log.Printf("INFO: Loaded schema from %s", path)
+			break
+		}
+	}
+
+	if content == nil {
+		// Last resort: try to find it relative to this file using runtime.Caller
+		// This will work in development but not in containers
+		absPath, _ := filepath.Abs("../../database/schema/schema.sql")
+		content, err = os.ReadFile(absPath)
+		if err != nil {
+			log.Fatalf("Failed to read schema.sql from any location. Tried: %v. Last error: %v", locations, err)
+		}
+	}
+
 	SchemaFile = string(content)
 }