Add production deployment config, Alembic migration, switch to Haiku

- Production Docker Compose with Caddy reverse proxy, Gunicorn, Nginx
- Multi-stage frontend build for production
- Deploy script and automated database backup script
- Initial Alembic migration with all tables
- Switch recommendation model from Sonnet to Haiku for cost efficiency

backend/Dockerfile.prod

@@ -0,0 +1,16 @@
+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends gcc libpq-dev && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt gunicorn
+
+COPY . .
+
+RUN alembic upgrade head 2>/dev/null || true
+
+EXPOSE 8000
+
+CMD ["sh", "-c", "alembic upgrade head && gunicorn app.main:app -w 4 -k uvicorn.workers.UvicornWorker -b 0.0.0.0:8000"]

backend/alembic/versions/001_initial.py

@@ -0,0 +1,90 @@
+"""Initial schema
+
+Revision ID: 001
+Revises:
+Create Date: 2026-03-30
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = "001"
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "users",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("email", sa.String(255), unique=True, index=True, nullable=False),
+        sa.Column("name", sa.String(255), nullable=False),
+        sa.Column("hashed_password", sa.String(255), nullable=True),
+        sa.Column("is_pro", sa.Boolean(), default=False, nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("spotify_id", sa.String(255), unique=True, nullable=True),
+        sa.Column("spotify_access_token", sa.Text(), nullable=True),
+        sa.Column("spotify_refresh_token", sa.Text(), nullable=True),
+        sa.Column("stripe_customer_id", sa.String(255), unique=True, nullable=True),
+        sa.Column("stripe_subscription_id", sa.String(255), nullable=True),
+    )
+
+    op.create_table(
+        "playlists",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("user_id", sa.Integer(), sa.ForeignKey("users.id", ondelete="CASCADE"), index=True, nullable=False),
+        sa.Column("name", sa.String(500), nullable=False),
+        sa.Column("platform_source", sa.String(50), nullable=False),
+        sa.Column("external_id", sa.String(255), nullable=True),
+        sa.Column("track_count", sa.Integer(), default=0, nullable=False),
+        sa.Column("taste_profile", sa.JSON(), nullable=True),
+        sa.Column("imported_at", sa.DateTime(timezone=True), nullable=False),
+    )
+
+    op.create_table(
+        "tracks",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("playlist_id", sa.Integer(), sa.ForeignKey("playlists.id", ondelete="CASCADE"), index=True, nullable=False),
+        sa.Column("title", sa.String(500), nullable=False),
+        sa.Column("artist", sa.String(500), nullable=False),
+        sa.Column("album", sa.String(500), nullable=True),
+        sa.Column("spotify_id", sa.String(255), nullable=True),
+        sa.Column("isrc", sa.String(20), nullable=True),
+        sa.Column("preview_url", sa.String(500), nullable=True),
+        sa.Column("image_url", sa.String(500), nullable=True),
+        sa.Column("tempo", sa.Float(), nullable=True),
+        sa.Column("energy", sa.Float(), nullable=True),
+        sa.Column("danceability", sa.Float(), nullable=True),
+        sa.Column("valence", sa.Float(), nullable=True),
+        sa.Column("acousticness", sa.Float(), nullable=True),
+        sa.Column("instrumentalness", sa.Float(), nullable=True),
+        sa.Column("genres", sa.JSON(), nullable=True),
+    )
+
+    op.create_table(
+        "recommendations",
+        sa.Column("id", sa.Integer(), primary_key=True),
+        sa.Column("user_id", sa.Integer(), sa.ForeignKey("users.id", ondelete="CASCADE"), index=True, nullable=False),
+        sa.Column("playlist_id", sa.Integer(), sa.ForeignKey("playlists.id", ondelete="SET NULL"), nullable=True),
+        sa.Column("title", sa.String(500), nullable=False),
+        sa.Column("artist", sa.String(500), nullable=False),
+        sa.Column("album", sa.String(500), nullable=True),
+        sa.Column("spotify_id", sa.String(255), nullable=True),
+        sa.Column("preview_url", sa.String(500), nullable=True),
+        sa.Column("image_url", sa.String(500), nullable=True),
+        sa.Column("reason", sa.Text(), nullable=False),
+        sa.Column("score", sa.Float(), nullable=True),
+        sa.Column("query", sa.Text(), nullable=True),
+        sa.Column("saved", sa.Boolean(), default=False, nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
+    )
+
+
+def downgrade() -> None:
+    op.drop_table("recommendations")
+    op.drop_table("tracks")
+    op.drop_table("playlists")
+    op.drop_table("users")

backend/app/services/recommender.py

@@ -135,7 +135,7 @@ Return ONLY the JSON array, no other text."""
     # Call Claude API
     client = anthropic.Anthropic(api_key=settings.ANTHROPIC_API_KEY)
     message = client.messages.create(
-        model="claude-sonnet-4-20250514",
+        model="claude-haiku-4-5-20251001",
         max_tokens=2000,
         messages=[{"role": "user", "content": prompt}],
     )