Implement Phase 2 Frontend and Phase 3 Data Enrichment

- Initialize React+Vite Frontend with Ant Design Dashboard.
- Implement Data Enrichment: ReccoBeats (Audio Features) and Spotify (Genres).
- Update Database Schema via Alembic Migrations.
- Add Docker support (Dockerfile, docker-compose.yml).
- Update README with hosting instructions.

backend/alembic/README

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+Generic single-database configuration.

backend/alembic/env.py

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+from logging.config import fileConfig
+import os
+import sys
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Add app to path to import models
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from app.database import Base
+from app.models import * # Import models to register them
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+# Override sqlalchemy.url with our app's URL
+config.set_main_option("sqlalchemy.url", "sqlite:///./music.db")
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

backend/alembic/script.py.mako

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+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, Sequence[str], None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    ${downgrades if downgrades else "pass"}

backend/alembic/versions/707387fe1be2_initial_schema_complete.py

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+"""Initial Schema Complete
+
+Revision ID: 707387fe1be2
+Revises:
+Create Date: 2025-12-24 21:23:43.744292
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '707387fe1be2'
+down_revision: Union[str, Sequence[str], None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('tracks',
+    sa.Column('id', sa.String(), nullable=False),
+    sa.Column('name', sa.String(), nullable=True),
+    sa.Column('artist', sa.String(), nullable=True),
+    sa.Column('album', sa.String(), nullable=True),
+    sa.Column('duration_ms', sa.Integer(), nullable=True),
+    sa.Column('popularity', sa.Integer(), nullable=True),
+    sa.Column('raw_data', sa.JSON(), nullable=True),
+    sa.Column('danceability', sa.Float(), nullable=True),
+    sa.Column('energy', sa.Float(), nullable=True),
+    sa.Column('key', sa.Integer(), nullable=True),
+    sa.Column('loudness', sa.Float(), nullable=True),
+    sa.Column('mode', sa.Integer(), nullable=True),
+    sa.Column('speechiness', sa.Float(), nullable=True),
+    sa.Column('acousticness', sa.Float(), nullable=True),
+    sa.Column('instrumentalness', sa.Float(), nullable=True),
+    sa.Column('liveness', sa.Float(), nullable=True),
+    sa.Column('valence', sa.Float(), nullable=True),
+    sa.Column('tempo', sa.Float(), nullable=True),
+    sa.Column('time_signature', sa.Integer(), nullable=True),
+    sa.Column('genres', sa.JSON(), nullable=True),
+    sa.Column('lyrics_summary', sa.String(), nullable=True),
+    sa.Column('genre_tags', sa.String(), nullable=True),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.Column('updated_at', sa.DateTime(), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_tracks_id'), 'tracks', ['id'], unique=False)
+    op.create_table('play_history',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('track_id', sa.String(), nullable=True),
+    sa.Column('played_at', sa.DateTime(), nullable=True),
+    sa.Column('context_uri', sa.String(), nullable=True),
+    sa.ForeignKeyConstraint(['track_id'], ['tracks.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_play_history_id'), 'play_history', ['id'], unique=False)
+    op.create_index(op.f('ix_play_history_played_at'), 'play_history', ['played_at'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_play_history_played_at'), table_name='play_history')
+    op.drop_index(op.f('ix_play_history_id'), table_name='play_history')
+    op.drop_table('play_history')
+    op.drop_index(op.f('ix_tracks_id'), table_name='tracks')
+    op.drop_table('tracks')
+    # ### end Alembic commands ###