diff --git a/.gitea/workflows/deploy-prod.yml b/.gitea/workflows/deploy-prod.yml
index b4bd915..5591bf8 100644
--- a/.gitea/workflows/deploy-prod.yml
+++ b/.gitea/workflows/deploy-prod.yml
@@ -15,6 +15,8 @@ env:
   DEPLOY_USER: kjh2064
   SERVICE_NAME: quantengine
   DOTNET_VERSION: '10.0.x'
+  QUANTENGINE_DB_NAME: quantenginedb
+  QUANTENGINE_DB_USER: quantengine_app
   TELEGRAM_BOT_TOKEN_DEFAULT: "8734507814:AAFyacLMai8GB4K-hQ_Nd3t3D01A-H1ZdV0"
   TELEGRAM_CHAT_ID_DEFAULT: "-5460205872"
 
@@ -97,6 +99,14 @@ jobs:
           chmod 600 ~/.ssh/id_ed25519
           ssh-keyscan -H ${{ env.DEPLOY_HOST }} >> ~/.ssh/known_hosts 2>/dev/null || true
 
+      - name: Prepare QuantEngine DB Env
+        run: |
+          mkdir -p ./deploy
+          cat > ./deploy/quantengine.env <<EOF
+ConnectionStrings__DefaultConnection=Host=127.0.0.1;Database=${QUANTENGINE_DB_NAME};Username=${QUANTENGINE_DB_USER};Password=${{ secrets.QUANTENGINE_DB_PASSWORD }};Search Path=quantengine;
+EOF
+          chmod 600 ./deploy/quantengine.env
+
       - name: Package Artifact
         run: |
           tar -czf quantengine.tar.gz -C ./publish .
@@ -143,10 +153,15 @@ jobs:
             quantengine.tar.gz "$DEPLOY_USER@$DEPLOY_HOST:/home/kjh2064/tmp/quantengine.tar.gz"
           scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ~/.ssh/id_ed25519 \
             tools/deploy_quantengine.sh "$DEPLOY_USER@$DEPLOY_HOST:/home/kjh2064/tmp/deploy.sh"
+          scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ~/.ssh/id_ed25519 \
+            deploy/quantengine.env "$DEPLOY_USER@$DEPLOY_HOST:/home/kjh2064/tmp/quantengine.env"
 
           ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ~/.ssh/id_ed25519 \
             "$DEPLOY_USER@$DEPLOY_HOST" "chmod +x /home/kjh2064/tmp/deploy.sh && CI_DEPLOY=1 /home/kjh2064/tmp/deploy.sh"
 
+          ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ~/.ssh/id_ed25519 \
+            "$DEPLOY_USER@$DEPLOY_HOST" "mkdir -p /home/kjh2064/.config && install -m 600 /home/kjh2064/tmp/quantengine.env /home/kjh2064/.config/quantengine.env && rm -f /home/kjh2064/tmp/quantengine.env"
+
           echo "=== Verifying Loopback Health ==="
           loopback_headers=$(ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ~/.ssh/id_ed25519 "$DEPLOY_USER@$DEPLOY_HOST" "curl -s -D - -o /dev/null http://127.0.0.1:5000/")
           echo "$loopback_headers"
diff --git a/docs/POSTGRESQL_SECURITY_GUIDE.md b/docs/POSTGRESQL_SECURITY_GUIDE.md
index 007deec..450b624 100644
--- a/docs/POSTGRESQL_SECURITY_GUIDE.md
+++ b/docs/POSTGRESQL_SECURITY_GUIDE.md
@@ -9,7 +9,7 @@ This document outlines the security configuration, role definitions, and access
 The Quant Investment Engine operates strictly within the `quantengine` schema to prevent namespace pollution and protect system catalog tables.
 
 * **Schema**: `quantengine`
-* **Default Database**: `giteadb`
+* **Default Database**: `quantenginedb`
 
 ---
 
@@ -22,7 +22,7 @@ To ensure the principle of least privilege, we define three main database roles:
 * **Permissions**:
   ```sql
   CREATE ROLE quantengine_owner WITH LOGIN PASSWORD 'OwnerPasswordSecure';
-  GRANT ALL PRIVILEGES ON DATABASE giteadb TO quantengine_owner;
+  GRANT ALL PRIVILEGES ON DATABASE quantenginedb TO quantengine_owner;
   GRANT ALL PRIVILEGES ON SCHEMA quantengine TO quantengine_owner;
   ALTER DEFAULT PRIVILEGES IN SCHEMA quantengine GRANT ALL ON TABLES TO quantengine_owner;
   ```
@@ -32,7 +32,7 @@ To ensure the principle of least privilege, we define three main database roles:
 * **Permissions**:
   ```sql
   CREATE ROLE quantengine_app WITH LOGIN PASSWORD 'AppPasswordSecure';
-  GRANT CONNECT ON DATABASE giteadb TO quantengine_app;
+  GRANT CONNECT ON DATABASE quantenginedb TO quantengine_app;
   GRANT USAGE ON SCHEMA quantengine TO quantengine_app;
   
   -- Grant CRUD permissions on tables & sequences
@@ -48,7 +48,7 @@ To ensure the principle of least privilege, we define three main database roles:
 * **Permissions**:
   ```sql
   CREATE ROLE quantengine_readonly WITH LOGIN PASSWORD 'ReadonlyPasswordSecure';
-  GRANT CONNECT ON DATABASE giteadb TO quantengine_readonly;
+  GRANT CONNECT ON DATABASE quantenginedb TO quantengine_readonly;
   GRANT USAGE ON SCHEMA quantengine TO quantengine_readonly;
   
   GRANT SELECT ON ALL TABLES IN SCHEMA quantengine TO quantengine_readonly;
@@ -63,7 +63,7 @@ To ensure the principle of least privilege, we define three main database roles:
    * Never store connection strings with plaintext passwords in version control.
    * `appsettings.json` must only contain placeholder configurations.
    * Inject the connection string at runtime using environment variables:
-     `ConnectionStrings__DefaultConnection="Host=127.0.0.1;Database=giteadb;Username=quantengine_app;Password=YourSecurePassword;Search Path=quantengine;"`
+     `ConnectionStrings__DefaultConnection="Host=127.0.0.1;Database=quantenginedb;Username=quantengine_app;Password=YourSecurePassword;Search Path=quantengine;"`
 
 2. **Network Security**:
    * Bind PostgreSQL only to local interfaces (`127.0.0.1`) or secure private network interfaces.
diff --git a/src/dotnet/QuantEngine.Web/Program.cs b/src/dotnet/QuantEngine.Web/Program.cs
index 78dc3c5..ba96c3a 100644
--- a/src/dotnet/QuantEngine.Web/Program.cs
+++ b/src/dotnet/QuantEngine.Web/Program.cs
@@ -46,8 +46,16 @@ builder.Services.AddAuthorizationCore();
 builder.Services.AddMudServices();
 
 // PostgreSQL Dapper Setup
-var connectionString = builder.Configuration.GetConnectionString("DefaultConnection")
-    ?? "Host=127.0.0.1;Database=giteadb;Username=gitea;Password=C8RFlZ9fdQrBA1vyLhLDS4v70I8dJfRS2ERJW4+zsS4=;Search Path=quantengine;";
+var configuredConnectionString = builder.Configuration.GetConnectionString("DefaultConnection");
+var fallbackConnectionString = "Host=127.0.0.1;Database=quantenginedb;Username=quantengine_app;Password=CHANGE_ME;Search Path=quantengine;";
+var connectionString = string.IsNullOrWhiteSpace(configuredConnectionString) || configuredConnectionString.Contains("Password=;", StringComparison.OrdinalIgnoreCase)
+    ? fallbackConnectionString
+    : configuredConnectionString;
+var configuredDatabase = new Npgsql.NpgsqlConnectionStringBuilder(connectionString).Database;
+if (!string.Equals(configuredDatabase, "quantenginedb", StringComparison.OrdinalIgnoreCase))
+{
+    throw new InvalidOperationException("QuantEngine must use the quantenginedb PostgreSQL database.");
+}
 builder.Services.AddSingleton<IDbConnectionFactory>(new DbConnectionFactory(connectionString));
 builder.Services.AddSingleton<DbMigrator>();
 builder.Services.AddScoped<IWorkspaceRepository, WorkspaceRepository>();
diff --git a/src/dotnet/QuantEngine.Web/appsettings.json b/src/dotnet/QuantEngine.Web/appsettings.json
index b1a203e..59bdd44 100644
--- a/src/dotnet/QuantEngine.Web/appsettings.json
+++ b/src/dotnet/QuantEngine.Web/appsettings.json
@@ -7,7 +7,7 @@
   },
   "AllowedHosts": "*",
   "ConnectionStrings": {
-    "DefaultConnection": "Host=127.0.0.1;Database=giteadb;Username=gitea;Password=;Search Path=quantengine;"
+    "DefaultConnection": "Host=127.0.0.1;Database=quantenginedb;Username=quantengine_app;Password=;Search Path=quantengine;"
   },
   "AdminSettings": {
     "Username": "admin",
diff --git a/tools/setup_host.sh b/tools/setup_host.sh
index d4ac476..d4e5ad3 100644
--- a/tools/setup_host.sh
+++ b/tools/setup_host.sh
@@ -6,6 +6,7 @@ set -e
 
 NGINX_CONF="/etc/nginx/sites-available/gitea-ip.conf"
 SERVICE_FILE="/etc/systemd/system/quantengine.service"
+APP_ENV_FILE="/home/kjh2064/.config/quantengine.env"
 
 echo "========================================="
 echo "Configuring Host Infrastructure Services"
@@ -61,6 +62,7 @@ User=kjh2064
 Environment=ASPNETCORE_ENVIRONMENT=Production
 Environment=ASPNETCORE_URLS=http://127.0.0.1:5000
 Environment=DOTNET_PRINT_TELEMETRY_MESSAGE=false
+EnvironmentFile=-/home/kjh2064/.config/quantengine.env
 
 [Install]
 WantedBy=multi-user.target
diff --git a/tools/setup_quantengine_postgresql_db.sh b/tools/setup_quantengine_postgresql_db.sh
new file mode 100644
index 0000000..5cbfc48
--- /dev/null
+++ b/tools/setup_quantengine_postgresql_db.sh
@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+# Create the QuantEngine database and application role on the local PostgreSQL instance.
+
+set -euo pipefail
+
+DB_NAME="${DB_NAME:-quantenginedb}"
+DB_USER="${DB_USER:-quantengine_app}"
+DB_PASSWORD="${DB_PASSWORD:-CHANGE_ME}"
+DB_HOST="${DB_HOST:-127.0.0.1}"
+DB_PORT="${DB_PORT:-5432}"
+ADMIN_DB="${ADMIN_DB:-postgres}"
+SCHEMA_NAME="${SCHEMA_NAME:-quantengine}"
+
+echo "Creating database and role for ${DB_NAME}..."
+sudo -u postgres psql -h "${DB_HOST}" -p "${DB_PORT}" -d "${ADMIN_DB}" -v ON_ERROR_STOP=1 <<SQL
+DO \$\$
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM pg_roles WHERE rolname = '${DB_USER}') THEN
+        CREATE ROLE ${DB_USER} LOGIN PASSWORD '${DB_PASSWORD}';
+    ELSE
+        ALTER ROLE ${DB_USER} WITH LOGIN PASSWORD '${DB_PASSWORD}';
+    END IF;
+END
+\$\$;
+
+DO \$\$
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM pg_database WHERE datname = '${DB_NAME}') THEN
+        CREATE DATABASE ${DB_NAME} OWNER ${DB_USER};
+    END IF;
+END
+\$\$;
+SQL
+
+sudo -u postgres psql -h "${DB_HOST}" -p "${DB_PORT}" -d "${DB_NAME}" -v ON_ERROR_STOP=1 <<SQL
+CREATE SCHEMA IF NOT EXISTS ${SCHEMA_NAME} AUTHORIZATION ${DB_USER};
+GRANT ALL PRIVILEGES ON DATABASE ${DB_NAME} TO ${DB_USER};
+GRANT USAGE, CREATE ON SCHEMA ${SCHEMA_NAME} TO ${DB_USER};
+ALTER SCHEMA ${SCHEMA_NAME} OWNER TO ${DB_USER};
+SQL
+
+APP_ENV_FILE="${APP_ENV_FILE:-/home/kjh2064/.config/quantengine.env}"
+
+mkdir -p "$(dirname "${APP_ENV_FILE}")"
+cat > "${APP_ENV_FILE}" <<EOF
+ConnectionStrings__DefaultConnection=Host=127.0.0.1;Database=${DB_NAME};Username=${DB_USER};Password=${DB_PASSWORD};Search Path=${SCHEMA_NAME};
+EOF
+
+chmod 600 "${APP_ENV_FILE}"
+
+echo "Database setup completed: ${DB_NAME} / ${DB_USER}"
+echo "Wrote app env file: ${APP_ENV_FILE}"
diff --git a/tools/setup_quantenginedb.sql b/tools/setup_quantenginedb.sql
new file mode 100644
index 0000000..a96cff7
--- /dev/null
+++ b/tools/setup_quantenginedb.sql
@@ -0,0 +1,22 @@
+DO $$
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM pg_roles WHERE rolname = 'quantengine_app') THEN
+        CREATE ROLE quantengine_app LOGIN PASSWORD 'CHANGE_ME';
+    END IF;
+END
+$$;
+
+DO $$
+BEGIN
+    IF NOT EXISTS (SELECT 1 FROM pg_database WHERE datname = 'quantenginedb') THEN
+        CREATE DATABASE quantenginedb OWNER quantengine_app;
+    END IF;
+END
+$$;
+
+\connect quantenginedb
+
+CREATE SCHEMA IF NOT EXISTS quantengine AUTHORIZATION quantengine_app;
+ALTER SCHEMA quantengine OWNER TO quantengine_app;
+GRANT ALL PRIVILEGES ON DATABASE quantenginedb TO quantengine_app;
+GRANT USAGE, CREATE ON SCHEMA quantengine TO quantengine_app;
diff --git a/tools/verify_quantengine_db_setup.sh b/tools/verify_quantengine_db_setup.sh
new file mode 100644
index 0000000..7f268f0
--- /dev/null
+++ b/tools/verify_quantengine_db_setup.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+DB_HOST="${DB_HOST:-127.0.0.1}"
+DB_PORT="${DB_PORT:-5432}"
+DB_USER="${DB_USER:-quantengine_app}"
+DB_NAME="${DB_NAME:-quantenginedb}"
+
+echo "Checking database availability..."
+psql "host=${DB_HOST} port=${DB_PORT} dbname=${DB_NAME} user=${DB_USER}" -Atc "select current_database(), current_schema();"
+echo "Checking core tables..."
+psql "host=${DB_HOST} port=${DB_PORT} dbname=${DB_NAME} user=${DB_USER}" -Atc "\dt quantengine.*"