feat: Add database migrations and auth system

- Add Alembic for database migrations
- Implement user authentication system
- Update frontend styles and components
- Add new test audio functionality
- Update stream management and UI

alembic/README

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+Generic single-database configuration.

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 the project root to the Python path
+sys.path.insert(0, os.path.dirname(os.path.dirname(__file__)))
+
+# Import your SQLAlchemy models and engine
+from models import SQLModel
+from database import engine
+
+# 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)
+
+# Import all your SQLModel models here so that Alembic can detect them
+from models import User, DBSession
+
+# Set the target metadata to SQLModel.metadata
+target_metadata = SQLModel.metadata
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode."""
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+        compare_type=True,
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode."""
+    connectable = engine
+    
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, 
+            target_metadata=target_metadata,
+            compare_type=True,
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

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"}

alembic/versions/1ab2db0e4b5e_make_username_unique.py

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+"""make username unique
+
+Revision ID: 1ab2db0e4b5e
+Revises: 
+Create Date: 2025-06-27 13:04:10.085253
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+import sqlmodel
+
+# revision identifiers, used by Alembic.
+revision: str = '1ab2db0e4b5e'
+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."""
+    # 1. First, add the unique constraint to the username column
+    with op.batch_alter_table('user', schema=None) as batch_op:
+        batch_op.create_unique_constraint('uq_user_username', ['username'])
+    
+    # 2. Now create the dbsession table with the foreign key
+    op.create_table('dbsession',
+        sa.Column('token', sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column('user_id', sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column('ip_address', sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column('user_agent', sqlmodel.sql.sqltypes.AutoString(), nullable=False),
+        sa.Column('created_at', sa.DateTime(), nullable=False),
+        sa.Column('expires_at', sa.DateTime(), nullable=False),
+        sa.Column('is_active', sa.Boolean(), nullable=False),
+        sa.Column('last_activity', sa.DateTime(), nullable=False),
+        sa.ForeignKeyConstraint(['user_id'], ['user.username'], ),
+        sa.PrimaryKeyConstraint('token')
+    )
+    
+    # 3. Drop old tables if they exist
+    if op.get_bind().engine.dialect.has_table(op.get_bind(), 'session'):
+        op.drop_index(op.f('ix_session_token'), table_name='session')
+        op.drop_index(op.f('ix_session_user_id'), table_name='session')
+        op.drop_table('session')
+    
+    if op.get_bind().engine.dialect.has_table(op.get_bind(), 'publicstream'):
+        op.drop_table('publicstream')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # 1. First drop the dbsession table
+    op.drop_table('dbsession')
+    
+    # 2. Recreate the old tables
+    op.create_table('publicstream',
+        sa.Column('uid', sa.VARCHAR(), autoincrement=False, nullable=False),
+        sa.Column('size', sa.INTEGER(), autoincrement=False, nullable=False),
+        sa.Column('mtime', sa.INTEGER(), autoincrement=False, nullable=False),
+        sa.Column('updated_at', postgresql.TIMESTAMP(), autoincrement=False, nullable=False),
+        sa.PrimaryKeyConstraint('uid', name=op.f('publicstream_pkey'))
+    )
+    
+    op.create_table('session',
+        sa.Column('id', sa.INTEGER(), autoincrement=True, nullable=False),
+        sa.Column('user_id', sa.VARCHAR(), autoincrement=False, nullable=False),
+        sa.Column('token', sa.TEXT(), autoincrement=False, nullable=True),
+        sa.Column('ip_address', sa.VARCHAR(), autoincrement=False, nullable=False),
+        sa.Column('user_agent', sa.VARCHAR(), autoincrement=False, nullable=True),
+        sa.Column('created_at', postgresql.TIMESTAMP(), autoincrement=False, nullable=False),
+        sa.Column('expires_at', postgresql.TIMESTAMP(), autoincrement=False, nullable=False),
+        sa.Column('last_used_at', postgresql.TIMESTAMP(), autoincrement=False, nullable=False),
+        sa.Column('is_active', sa.BOOLEAN(), autoincrement=False, nullable=False),
+        sa.PrimaryKeyConstraint('id', name=op.f('session_pkey'))
+    )
+    
+    op.create_index(op.f('ix_session_user_id'), 'session', ['user_id'], unique=False)
+    op.create_index(op.f('ix_session_token'), 'session', ['token'], unique=True)
+    
+    # 3. Finally, remove the unique constraint from username
+    with op.batch_alter_table('user', schema=None) as batch_op:
+        batch_op.drop_constraint('uq_user_username', type_='unique')
+    # ### end Alembic commands ###

alembic/versions/f86c93c7a872_add_processed_filename_to_uploadlog.py

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+"""add_processed_filename_to_uploadlog
+
+Revision ID: f86c93c7a872
+Revises: 1ab2db0e4b5e
+Create Date: 2025-06-28 15:56:29.169668
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'f86c93c7a872'
+down_revision: Union[str, Sequence[str], None] = '1ab2db0e4b5e'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    op.add_column('uploadlog', 
+                 sa.Column('processed_filename', sa.String(), nullable=True),
+                 schema=None)
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    op.drop_column('uploadlog', 'processed_filename', schema=None)