diff --git a/backend/src/services/schemaConfigurationService.ts b/backend/src/services/schemaConfigurationService.ts
index f41a9bb..242a29f 100644
--- a/backend/src/services/schemaConfigurationService.ts
+++ b/backend/src/services/schemaConfigurationService.ts
@@ -10,6 +10,7 @@ import { logger } from './logger.js';
 import { normalizedCacheStore } from './normalizedCacheStore.js';
 import { config } from '../config/env.js';
 import { toPascalCase } from './schemaUtils.js';
+import type { DatabaseAdapter } from './database/interface.js';
 
 export interface JiraSchema {
   id: number;
@@ -62,12 +63,12 @@ class SchemaConfigurationService {
     schemaName: string;
     objectTypes: ConfiguredObjectType[];
   }>> {
-    const db = (normalizedCacheStore as any).db;
+    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
     if (!db) {
       throw new Error('Database not available');
     }
 
-    await db.ensureInitialized?.();
+    await (db as any).ensureInitialized?.();
 
     const rows = await db.query<{
       id: number;
@@ -141,12 +142,12 @@ class SchemaConfigurationService {
    * id format: "schemaId:objectTypeId" (e.g., "6:123")
    */
   async setObjectTypeEnabled(id: string, enabled: boolean): Promise<void> {
-    const db = (normalizedCacheStore as any).db;
+    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
     if (!db) {
       throw new Error('Database not available');
     }
 
-    await db.ensureInitialized?.();
+    await (db as any).ensureInitialized?.();
 
     // Parse id: "schemaId:objectTypeId"
     const [schemaIdStr, objectTypeIdStr] = id.split(':');
@@ -226,16 +227,16 @@ class SchemaConfigurationService {
    * Bulk update enabled status for multiple object types
    */
   async bulkSetObjectTypesEnabled(updates: Array<{ id: string; enabled: boolean }>): Promise<void> {
-    const db = (normalizedCacheStore as any).db;
+    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
     if (!db) {
       throw new Error('Database not available');
     }
 
-    await db.ensureInitialized?.();
+    await (db as any).ensureInitialized?.();
 
     const now = new Date().toISOString();
 
-    await db.transaction(async (txDb) => {
+    await db.transaction(async (txDb: DatabaseAdapter) => {
       for (const update of updates) {
         // Parse id: "schemaId:objectTypeId"
         const [schemaIdStr, objectTypeIdStr] = update.id.split(':');
@@ -321,12 +322,12 @@ class SchemaConfigurationService {
     objectTypeName: string;
     displayName: string;
   }>> {
-    const db = (normalizedCacheStore as any).db;
+    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
     if (!db) {
       throw new Error('Database not available');
     }
 
-    await db.ensureInitialized?.();
+    await (db as any).ensureInitialized?.();
 
     // Use parameterized query to avoid boolean/integer comparison issues
     const rows = await db.query<{
@@ -342,7 +343,12 @@ class SchemaConfigurationService {
       [db.isPostgres ? true : 1]
     );
 
-    return rows.map(row => ({
+    return rows.map((row: {
+      jira_schema_id: string;
+      jira_type_id: number;
+      type_name: string;
+      display_name: string;
+    }) => ({
       schemaId: row.jira_schema_id,
       objectTypeId: row.jira_type_id,
       objectTypeName: row.type_name,
@@ -368,12 +374,12 @@ class SchemaConfigurationService {
     disabledObjectTypes: number;
     isConfigured: boolean;
   }> {
-    const db = (normalizedCacheStore as any).db;
+    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
     if (!db) {
       throw new Error('Database not available');
     }
 
-    await db.ensureInitialized?.();
+    await (db as any).ensureInitialized?.();
 
     const totalRow = await db.queryOne<{ count: number }>(`
       SELECT COUNT(*) as count FROM object_types
@@ -410,12 +416,12 @@ class SchemaConfigurationService {
     schemaName: string;
     searchEnabled: boolean;
   }>> {
-    const db = (normalizedCacheStore as any).db;
+    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
     if (!db) {
       throw new Error('Database not available');
     }
 
-    await db.ensureInitialized?.();
+    await (db as any).ensureInitialized?.();
 
     const rows = await db.query<{
       jira_schema_id: string;
@@ -427,7 +433,11 @@ class SchemaConfigurationService {
       ORDER BY name ASC
     `);
 
-    return rows.map(row => ({
+    return rows.map((row: {
+      jira_schema_id: string;
+      name: string;
+      search_enabled: boolean | number;
+    }) => ({
       schemaId: row.jira_schema_id,
       schemaName: row.name,
       searchEnabled: typeof row.search_enabled === 'boolean' ? row.search_enabled : row.search_enabled === 1,
@@ -438,12 +448,12 @@ class SchemaConfigurationService {
    * Set search enabled status for a schema
    */
   async setSchemaSearchEnabled(schemaId: string, searchEnabled: boolean): Promise<void> {
-    const db = (normalizedCacheStore as any).db;
+    const db: DatabaseAdapter = (normalizedCacheStore as any).db;
     if (!db) {
       throw new Error('Database not available');
     }
 
-    await db.ensureInitialized?.();
+    await (db as any).ensureInitialized?.();
 
     const now = new Date().toISOString();