diff --git a/app/models/orm/assets.py b/app/models/orm/assets.py
index b5c6b3ef..b01b45d2 100644
--- a/app/models/orm/assets.py
+++ b/app/models/orm/assets.py
@@ -4,8 +4,8 @@
 class Asset(Base):
     __tablename__ = "assets"
     asset_id = db.Column(db.UUID, primary_key=True)
-    dataset = db.Column(db.String, nullable=False)
-    version = db.Column(db.String, nullable=False)
+    dataset = db.Column(db.String, nullable=False, index=True)
+    version = db.Column(db.String, nullable=False, index=True)
     asset_type = db.Column(db.String, nullable=False)
     asset_uri = db.Column(db.String, nullable=False)
     status = db.Column(db.String, nullable=False, default="pending")
diff --git a/app/models/orm/migrations/versions/3e524ef0525f_.py b/app/models/orm/migrations/versions/3e524ef0525f_.py
new file mode 100644
index 00000000..127937ee
--- /dev/null
+++ b/app/models/orm/migrations/versions/3e524ef0525f_.py
@@ -0,0 +1,32 @@
+"""empty message.
+
+Revision ID: 3e524ef0525f
+Revises: 604bf4e66c2b
+Create Date: 2024-12-18 00:43:46.681427
+"""
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "3e524ef0525f"
+down_revision = "604bf4e66c2b"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_index(op.f("ix_assets_dataset"), "assets", ["dataset"], unique=False)
+    op.create_index(op.f("ix_assets_version"), "assets", ["version"], unique=False)
+    op.add_column("dataset_metadata", sa.Column("subtitle", sa.String(), nullable=True))
+    op.add_column("version_metadata", sa.Column("subtitle", sa.String(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("version_metadata", "subtitle")
+    op.drop_column("dataset_metadata", "subtitle")
+    op.drop_index(op.f("ix_assets_version"), table_name="assets")
+    op.drop_index(op.f("ix_assets_dataset"), table_name="assets")
+    # ### end Alembic commands ###
diff --git a/app/models/orm/mixins.py b/app/models/orm/mixins.py
index c1cf744d..bed984fd 100644
--- a/app/models/orm/mixins.py
+++ b/app/models/orm/mixins.py
@@ -3,6 +3,7 @@
 
 class MetadataMixin:
     title = db.Column(db.String)
+    subtitle = db.Column(db.String)
     spatial_resolution = db.Column(db.Numeric)
     resolution_description = db.Column(db.String)
     geographic_coverage = db.Column(db.String)
diff --git a/app/models/pydantic/metadata.py b/app/models/pydantic/metadata.py
index 63e836d8..4c2dd0b2 100644
--- a/app/models/pydantic/metadata.py
+++ b/app/models/pydantic/metadata.py
@@ -3,7 +3,7 @@
 from uuid import UUID
 
 from fastapi import HTTPException
-from pydantic import Field, validator, BaseModel
+from pydantic import BaseModel, Field, validator
 from pydantic.utils import GetterDict
 
 from .base import BaseRecord, StrictBaseModel
@@ -34,6 +34,7 @@ class Config:
 
 class DatasetMetadata(CommonMetadata):
     title: Optional[str]
+    subtitle: Optional[str]
     source: Optional[str]
     license: Optional[str]
     data_language: Optional[str]
@@ -51,6 +52,7 @@ class Config:
             "examples": [
                 {
                     "title": "Deforestation alerts (GLAD-S2)",
+                    "subtitle": "Sentinel-2 based deforestation alerts",
                     "source": "Global Land Analysis and Discovery (GLAD), University of Maryland",
                     "license": "[CC BY 4.0](https://creativecommons.org/licenses/by/4.0/)",
                     "data_language": "en",