diff --git a/electron/servers/fastapi/alembic.ini b/electron/servers/fastapi/alembic.ini
index 816710ec..f11ee6ae 100644
--- a/electron/servers/fastapi/alembic.ini
+++ b/electron/servers/fastapi/alembic.ini
@@ -2,7 +2,7 @@
 # migrations.py sets these programmatically when running at app startup.
 
 [alembic]
-script_location = alembic
+script_location = %(here)s/alembic
 # sqlalchemy.url is overridden by env.py (uses DATABASE_URL or APP_DATA_DIRECTORY)
 sqlalchemy.url = sqlite:///placeholder
 
diff --git a/electron/servers/fastapi/alembic/env.py b/electron/servers/fastapi/alembic/env.py
index ff79a803..72da76b3 100644
--- a/electron/servers/fastapi/alembic/env.py
+++ b/electron/servers/fastapi/alembic/env.py
@@ -33,6 +33,9 @@ if alembic_config.config_file_name is not None:
 
 target_metadata = SQLModel.metadata
 
+# alembic.ini sets this so Config validates; treat it as "unset" for URL resolution.
+_CLI_PLACEHOLDER_DB_URL = "sqlite:///placeholder"
+
 
 def _to_sync_database_url(database_url: str) -> str:
     # Preserve slash counts for sqlite URLs so Windows paths stay valid.
@@ -51,7 +54,7 @@ def _get_url() -> str:
     falling back to the DATABASE_URL environment variable or a local SQLite DB.
     """
     configured = alembic_config.get_main_option("sqlalchemy.url")
-    if configured:
+    if configured and configured != _CLI_PLACEHOLDER_DB_URL:
         return configured
 
     from utils.db_utils import get_database_url_and_connect_args
diff --git a/electron/servers/fastapi/alembic/versions/7bdd5fd9eabf_add_theme_to_presentations.py b/electron/servers/fastapi/alembic/versions/7bdd5fd9eabf_add_theme_to_presentations.py
new file mode 100644
index 00000000..7508d67e
--- /dev/null
+++ b/electron/servers/fastapi/alembic/versions/7bdd5fd9eabf_add_theme_to_presentations.py
@@ -0,0 +1,30 @@
+"""add_theme_to_presentations
+
+Revision ID: 7bdd5fd9eabf
+Revises: 00b3c27a13bc
+Create Date: 2026-03-25 18:52:10.116838
+
+"""
+from typing import Sequence, Union
+
+from alembic import op  # type: ignore[import-not-found]
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '7bdd5fd9eabf'
+down_revision: Union[str, None] = '00b3c27a13bc'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('presentations', sa.Column('theme', sa.JSON(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('presentations', 'theme')
+    # ### end Alembic commands ###
diff --git a/electron/servers/fastapi/migrations.py b/electron/servers/fastapi/migrations.py
index 51857107..d6356f2c 100644
--- a/electron/servers/fastapi/migrations.py
+++ b/electron/servers/fastapi/migrations.py
@@ -3,10 +3,14 @@ from pathlib import Path
 
 from alembic import command
 from alembic.config import Config
+from alembic.script import ScriptDirectory
+from sqlalchemy import create_engine, inspect, text
 
 from utils.db_utils import get_database_url_and_connect_args
 from utils.get_env import get_migrate_database_on_startup_env
 
+LEGACY_BASELINE_REVISION = "00b3c27a13bc"
+
 
 def _to_sync_database_url(database_url: str) -> str:
     # Preserve slash counts for sqlite URLs so Windows paths stay valid.
@@ -28,6 +32,12 @@ async def migrate_database_on_startup() -> None:
         print("Migrations run successfully", flush=True)
     except Exception as exc:
         print(f"Error running migrations: {exc}", flush=True)
+        raise
+
+
+def run_migrations_sync() -> None:
+    """Apply Alembic migrations to head (for CLI/scripts; no env gate)."""
+    _run_migrations()
 
 
 def _run_migrations() -> None:
@@ -43,4 +53,55 @@ def _run_migrations() -> None:
     database_url = _to_sync_database_url(database_url)
 
     config.set_main_option("sqlalchemy.url", database_url)
-    command.upgrade(config, "head")
+
+    try:
+        command.upgrade(config, "head")
+    except Exception as exc:
+        # Recovery path for historical DBs that were created via create_all()
+        # without an alembic_version table.
+        if _is_unversioned_populated_database(database_url):
+            script = ScriptDirectory.from_config(config)
+            known_revisions = {rev.revision for rev in script.walk_revisions()}
+            baseline_revision = (
+                LEGACY_BASELINE_REVISION
+                if LEGACY_BASELINE_REVISION in known_revisions
+                else script.get_base()
+            )
+            print(
+                "Detected existing unversioned database schema. "
+                f"Stamping revision to {baseline_revision} before upgrading.",
+                flush=True,
+            )
+            command.stamp(config, baseline_revision)
+            command.upgrade(config, "head")
+            return
+        raise
+
+
+def _is_unversioned_populated_database(database_url: str) -> bool:
+    known_app_tables = {
+        "presentations",
+        "slides",
+        "templates",
+        "keyvaluesqlmodel",
+        "imageasset",
+        "presentation_layout_codes",
+        "async_presentation_generation_tasks",
+        "webhook_subscriptions",
+    }
+    engine = create_engine(database_url)
+    try:
+        with engine.connect() as connection:
+            inspector = inspect(connection)
+            table_names = set(inspector.get_table_names())
+            has_alembic_version_table = "alembic_version" in table_names
+            has_applied_revision = False
+            if has_alembic_version_table:
+                revision_count = connection.execute(
+                    text("SELECT COUNT(*) FROM alembic_version")
+                ).scalar_one()
+                has_applied_revision = revision_count > 0
+            has_known_app_tables = len(table_names.intersection(known_app_tables)) > 0
+            return has_known_app_tables and not has_applied_revision
+    finally:
+        engine.dispose()
diff --git a/electron/servers/fastapi/scripts/fresh_sqlite_migrate.py b/electron/servers/fastapi/scripts/fresh_sqlite_migrate.py
new file mode 100644
index 00000000..82923672
--- /dev/null
+++ b/electron/servers/fastapi/scripts/fresh_sqlite_migrate.py
@@ -0,0 +1,74 @@
+#!/usr/bin/env python3
+"""
+Delete local SQLite database files and run migrations programmatically (same as app startup).
+
+Use this when alembic_version points at a removed revision or you want a clean DB.
+
+From electron/servers/fastapi:
+
+  uv run python scripts/fresh_sqlite_migrate.py
+
+Optional — match Electron dev layout (default if unset):
+
+  APP_DATA_DIRECTORY=/abs/path/to/electron/app_data uv run python scripts/fresh_sqlite_migrate.py
+
+Then create migrations from models (DB is at init only):
+
+  uv run alembic revision --autogenerate -m "add_theme_to_presentations"
+"""
+from __future__ import annotations
+
+import os
+import sys
+from pathlib import Path
+
+# servers/fastapi as import root (same as runtime)
+_FASTAPI_ROOT = Path(__file__).resolve().parents[1]
+if str(_FASTAPI_ROOT) not in sys.path:
+    sys.path.insert(0, str(_FASTAPI_ROOT))
+
+os.environ.setdefault(
+    "APP_DATA_DIRECTORY",
+    str(_FASTAPI_ROOT.parent.parent / "app_data"),
+)
+os.environ.setdefault("MIGRATE_DATABASE_ON_STARTUP", "True")
+
+from migrations import _to_sync_database_url, run_migrations_sync  # noqa: E402
+from utils.db_utils import get_database_url_and_connect_args  # noqa: E402
+
+
+def _sqlite_file_path(sync_url: str) -> Path | None:
+    if not sync_url.startswith("sqlite:///"):
+        return None
+    raw = sync_url[len("sqlite:///") :]
+    if os.name == "nt" and len(raw) >= 3 and raw[0] == "/" and raw[2] == ":":
+        raw = raw[1:]
+    return Path(raw)
+
+
+def main() -> None:
+    database_url, _ = get_database_url_and_connect_args()
+    sync_url = _to_sync_database_url(database_url)
+    paths: list[Path] = []
+
+    p = _sqlite_file_path(sync_url)
+    if p is not None:
+        paths.append(p)
+        paths.append(p.parent / "container.db")
+
+    seen: set[Path] = set()
+    for path in paths:
+        if path in seen:
+            continue
+        seen.add(path)
+        if path.is_file():
+            print(f"Removing {path}", flush=True)
+            path.unlink()
+
+    print("Running Alembic upgrade (programmatic)...", flush=True)
+    run_migrations_sync()
+    print("Done.", flush=True)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/electron/servers/fastapi/services/database.py b/electron/servers/fastapi/services/database.py
index 6149447a..7188cd92 100644
--- a/electron/servers/fastapi/services/database.py
+++ b/electron/servers/fastapi/services/database.py
@@ -21,6 +21,7 @@ from models.sql.template import TemplateModel
 from models.sql.webhook_subscription import WebhookSubscription
 from utils.db_utils import get_database_url_and_connect_args
 from utils.get_env import get_app_data_directory_env
+from utils.get_env import get_migrate_database_on_startup_env
 
 
 database_url, connect_args = get_database_url_and_connect_args()
@@ -52,22 +53,24 @@ async def get_container_db_async_session() -> AsyncGenerator[AsyncSession, None]
 
 # Create Database and Tables
 async def create_db_and_tables():
-    async with sql_engine.begin() as conn:
-        await conn.run_sync(
-            lambda sync_conn: SQLModel.metadata.create_all(
-                sync_conn,
-                tables=[
-                    PresentationModel.__table__,
-                    SlideModel.__table__,
-                    KeyValueSqlModel.__table__,
-                    ImageAsset.__table__,
-                    PresentationLayoutCodeModel.__table__,
-                    TemplateModel.__table__,
-                    WebhookSubscription.__table__,
-                    AsyncPresentationGenerationTaskModel.__table__,
-                ],
+    should_run_alembic = get_migrate_database_on_startup_env() in ["true", "True"]
+    if not should_run_alembic:
+        async with sql_engine.begin() as conn:
+            await conn.run_sync(
+                lambda sync_conn: SQLModel.metadata.create_all(
+                    sync_conn,
+                    tables=[
+                        PresentationModel.__table__,
+                        SlideModel.__table__,
+                        KeyValueSqlModel.__table__,
+                        ImageAsset.__table__,
+                        PresentationLayoutCodeModel.__table__,
+                        TemplateModel.__table__,
+                        WebhookSubscription.__table__,
+                        AsyncPresentationGenerationTaskModel.__table__,
+                    ],
+                )
             )
-        )
 
     async with container_db_engine.begin() as conn:
         await conn.run_sync(
diff --git a/electron/servers/fastapi/services/image_generation_service.py b/electron/servers/fastapi/services/image_generation_service.py
index f9ec1202..adbf881a 100644
--- a/electron/servers/fastapi/services/image_generation_service.py
+++ b/electron/servers/fastapi/services/image_generation_service.py
@@ -5,6 +5,7 @@ import os
 import aiohttp
 from fastapi import HTTPException
 from google import genai
+from google.genai import types
 from openai import NOT_GIVEN, AsyncOpenAI
 from models.image_prompt import ImagePrompt
 from models.sql.image_asset import ImageAsset
@@ -149,15 +150,39 @@ class ImageGenerationService:
         response = await asyncio.to_thread(
             client.models.generate_content,
             model=model,
-            contents=[prompt],
+            contents=prompt,
+            config=types.GenerateContentConfig(
+                response_modalities=["IMAGE"],
+            ),
         )
 
+        # Latest SDK docs expose images in response.parts.
+        response_parts = getattr(response, "parts", None)
+        if not response_parts and getattr(response, "candidates", None):
+            first_candidate = response.candidates[0] if response.candidates else None
+            content = getattr(first_candidate, "content", None) if first_candidate else None
+            response_parts = getattr(content, "parts", None) if content else None
+
         image_path = None
-        for part in response.candidates[0].content.parts:
+        for part in response_parts or []:
             if part.inline_data is not None:
-                image = part.as_image()
-                image_path = os.path.join(output_directory, f"{uuid.uuid4()}.jpg")
-                image.save(image_path)
+                mime_type = getattr(part.inline_data, "mime_type", "") or ""
+                ext = mime_type.split("/")[-1] if mime_type.startswith("image/") else "png"
+                image_path = os.path.join(output_directory, f"{uuid.uuid4()}.{ext}")
+                if hasattr(part, "as_image"):
+                    part.as_image().save(image_path)
+                else:
+                    # Backward-compatible fallback if helper method is unavailable.
+                    image_data = getattr(part.inline_data, "data", None)
+                    if image_data is None:
+                        continue
+                    image_bytes = (
+                        base64.b64decode(image_data)
+                        if isinstance(image_data, str)
+                        else image_data
+                    )
+                    with open(image_path, "wb") as image_file:
+                        image_file.write(image_bytes)
 
         if not image_path:
             raise HTTPException(
@@ -169,9 +194,9 @@ class ImageGenerationService:
     async def generate_image_gemini_flash(
         self, prompt: str, output_directory: str
     ) -> str:
-        """Generate image using Gemini Flash (gemini-2.5-flash-image-preview)."""
+        """Generate image using Gemini Flash (gemini-2.5-flash-image)."""
         return await self._generate_image_google(
-            prompt, output_directory, "gemini-2.5-flash-image-preview"
+            prompt, output_directory, "gemini-2.5-flash-image"
         )
 
     async def generate_image_nanobanana_pro(
diff --git a/electron/servers/fastapi/uv.lock b/electron/servers/fastapi/uv.lock
index e31671a0..74a53a69 100644
--- a/electron/servers/fastapi/uv.lock
+++ b/electron/servers/fastapi/uv.lock
@@ -235,15 +235,6 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/1a/39/47f9197bdd44df24d67ac8893641e16f386c984a0619ef2ee4c51fbbc019/beautifulsoup4-4.14.3-py3-none-any.whl", hash = "sha256:0918bfe44902e6ad8d57732ba310582e98da931428d231a5ecb9e7c703a735bb", size = 107721, upload-time = "2025-11-30T15:08:24.087Z" },
 ]
 
-[[package]]
-name = "cachetools"
-version = "5.5.2"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/6c/81/3747dad6b14fa2cf53fcf10548cf5aea6913e96fab41a3c198676f8948a5/cachetools-5.5.2.tar.gz", hash = "sha256:1a661caa9175d26759571b2e19580f9d6393969e5dfca11fdb1f947a23e640d4", size = 28380, upload-time = "2025-02-20T21:01:19.524Z" }
-wheels = [
-    { url = "https://files.pythonhosted.org/packages/72/76/20fa66124dbe6be5cafeb312ece67de6b61dd91a0247d1ea13db4ebb33c2/cachetools-5.5.2-py3-none-any.whl", hash = "sha256:d26a22bcc62eb95c3beabd9f1ee5e820d3d2704fe2967cbe350e20c8ffcd3f0a", size = 10080, upload-time = "2025-02-20T21:01:16.647Z" },
-]
-
 [[package]]
 name = "certifi"
 version = "2025.8.3"
@@ -741,10 +732,10 @@ wheels = [
 [[package]]
 name = "filelock"
 version = "3.24.2"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/02/a8/dae62680be63cbb3ff87cfa2f51cf766269514ea5488479d42fec5aa6f3a/filelock-3.24.2.tar.gz", hash = "sha256:c22803117490f156e59fafce621f0550a7a853e2bbf4f87f112b11d469b6c81b", size = 37601, upload-time = "2026-02-16T02:50:45.614Z" }
+source = { registry = "https://download.pytorch.org/whl/cpu" }
+sdist = { url = "https://files.pythonhosted.org/packages/02/a8/dae62680be63cbb3ff87cfa2f51cf766269514ea5488479d42fec5aa6f3a/filelock-3.24.2.tar.gz", hash = "sha256:c22803117490f156e59fafce621f0550a7a853e2bbf4f87f112b11d469b6c81b" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/e7/04/a94ebfb4eaaa08db56725a40de2887e95de4e8641b9e902c311bfa00aa39/filelock-3.24.2-py3-none-any.whl", hash = "sha256:667d7dc0b7d1e1064dd5f8f8e80bdac157a6482e8d2e02cd16fd3b6b33bd6556", size = 24152, upload-time = "2026-02-16T02:50:44Z" },
+    { url = "https://files.pythonhosted.org/packages/e7/04/a94ebfb4eaaa08db56725a40de2887e95de4e8641b9e902c311bfa00aa39/filelock-3.24.2-py3-none-any.whl", hash = "sha256:667d7dc0b7d1e1064dd5f8f8e80bdac157a6482e8d2e02cd16fd3b6b33bd6556" },
 ]
 
 [[package]]
@@ -793,43 +784,49 @@ wheels = [
 [[package]]
 name = "fsspec"
 version = "2026.2.0"
-source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/51/7c/f60c259dcbf4f0c47cc4ddb8f7720d2dcdc8888c8e5ad84c73ea4531cc5b/fsspec-2026.2.0.tar.gz", hash = "sha256:6544e34b16869f5aacd5b90bdf1a71acb37792ea3ddf6125ee69a22a53fb8bff", size = 313441, upload-time = "2026-02-05T21:50:53.743Z" }
+source = { registry = "https://download.pytorch.org/whl/cpu" }
+sdist = { url = "https://files.pythonhosted.org/packages/51/7c/f60c259dcbf4f0c47cc4ddb8f7720d2dcdc8888c8e5ad84c73ea4531cc5b/fsspec-2026.2.0.tar.gz", hash = "sha256:6544e34b16869f5aacd5b90bdf1a71acb37792ea3ddf6125ee69a22a53fb8bff" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/e6/ab/fb21f4c939bb440104cc2b396d3be1d9b7a9fd3c6c2a53d98c45b3d7c954/fsspec-2026.2.0-py3-none-any.whl", hash = "sha256:98de475b5cb3bd66bedd5c4679e87b4fdfe1a3bf4d707b151b3c07e58c9a2437", size = 202505, upload-time = "2026-02-05T21:50:51.819Z" },
+    { url = "https://files.pythonhosted.org/packages/e6/ab/fb21f4c939bb440104cc2b396d3be1d9b7a9fd3c6c2a53d98c45b3d7c954/fsspec-2026.2.0-py3-none-any.whl", hash = "sha256:98de475b5cb3bd66bedd5c4679e87b4fdfe1a3bf4d707b151b3c07e58c9a2437" },
 ]
 
 [[package]]
 name = "google-auth"
-version = "2.40.3"
+version = "2.49.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "cachetools" },
+    { name = "cryptography" },
     { name = "pyasn1-modules" },
-    { name = "rsa" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/9e/9b/e92ef23b84fa10a64ce4831390b7a4c2e53c0132568d99d4ae61d04c8855/google_auth-2.40.3.tar.gz", hash = "sha256:500c3a29adedeb36ea9cf24b8d10858e152f2412e3ca37829b3fa18e33d63b77", size = 281029, upload-time = "2025-06-04T18:04:57.577Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/ea/80/6a696a07d3d3b0a92488933532f03dbefa4a24ab80fb231395b9a2a1be77/google_auth-2.49.1.tar.gz", hash = "sha256:16d40da1c3c5a0533f57d268fe72e0ebb0ae1cc3b567024122651c045d879b64", size = 333825, upload-time = "2026-03-12T19:30:58.135Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/17/63/b19553b658a1692443c62bd07e5868adaa0ad746a0751ba62c59568cd45b/google_auth-2.40.3-py2.py3-none-any.whl", hash = "sha256:1370d4593e86213563547f97a92752fc658456fe4514c809544f330fed45a7ca", size = 216137, upload-time = "2025-06-04T18:04:55.573Z" },
+    { url = "https://files.pythonhosted.org/packages/e9/eb/c6c2478d8a8d633460be40e2a8a6f8f429171997a35a96f81d3b680dec83/google_auth-2.49.1-py3-none-any.whl", hash = "sha256:195ebe3dca18eddd1b3db5edc5189b76c13e96f29e73043b923ebcf3f1a860f7", size = 240737, upload-time = "2026-03-12T19:30:53.159Z" },
+]
+
+[package.optional-dependencies]
+requests = [
+    { name = "requests" },
 ]
 
 [[package]]
 name = "google-genai"
-version = "1.28.0"
+version = "1.68.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio" },
-    { name = "google-auth" },
+    { name = "distro" },
+    { name = "google-auth", extra = ["requests"] },
     { name = "httpx" },
     { name = "pydantic" },
     { name = "requests" },
+    { name = "sniffio" },
     { name = "tenacity" },
     { name = "typing-extensions" },
     { name = "websockets" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/23/f1/039bb08df4670e204c55b5da0b2fa5228dff3346bda01389a86b300f6f58/google_genai-1.28.0.tar.gz", hash = "sha256:e93053c02e616842679ba5ecce5b99db8c0ca6310623c55ff6245b5b1d293138", size = 221029, upload-time = "2025-07-30T21:39:57.002Z" }
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