Add Alembic migration for TSS database schema updates

Co-authored-by: joaovitoriasilva <8648976+joaovitoriasilva@users.noreply.github.com>

backend/app/alembic/versions/v0_14_1_tss_migration.py

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+"""v0.14.1 migration - Add TSS support
+
+Revision ID: tss_support_001
+Revises: 86b2e24e227e
+Create Date: 2024-12-08 22:30:00.000000
+
+"""
+
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy import text
+
+# revision identifiers, used by Alembic.
+revision: str = "tss_support_001"
+down_revision: Union[str, None] = "86b2e24e227e"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # Add TSS column to activities table
+    op.add_column('activities', 
+        sa.Column('tss', sa.Integer(), nullable=True, comment='Training Stress Score (TSS) for the activity')
+    )
+    
+    # Add threshold fields to users table for TSS calculations
+    op.add_column('users', 
+        sa.Column('ftp', sa.Integer(), nullable=True, comment='Functional Threshold Power (FTP) in watts for TSS calculation')
+    )
+    op.add_column('users', 
+        sa.Column('lthr', sa.Integer(), nullable=True, comment='Lactate Threshold Heart Rate (LTHR) in bpm for hrTSS calculation')
+    )
+    op.add_column('users', 
+        sa.Column('run_threshold_pace', sa.DECIMAL(precision=20, scale=10), nullable=True, comment='Running threshold pace in seconds per meter for rTSS calculation')
+    )
+    op.add_column('users', 
+        sa.Column('swim_threshold_pace', sa.DECIMAL(precision=20, scale=10), nullable=True, comment='Swimming threshold pace in seconds per meter for sTSS calculation')
+    )
+    
+    # Add migration record if it doesn't exist 
+    connection = op.get_bind()
+    
+    # Check if migration 6 record exists
+    result = connection.execute(text("SELECT COUNT(*) FROM migrations WHERE id = 6")).scalar()
+    
+    if result == 0:
+        # Insert migration 6 record
+        connection.execute(text("""
+            INSERT INTO migrations (id, name, description, executed) 
+            VALUES (6, 'TSS Support Migration', 'Add TSS calculation support with user threshold settings', 0)
+        """))
+
+
+def downgrade() -> None:
+    # Remove columns from users table
+    op.drop_column('users', 'swim_threshold_pace')
+    op.drop_column('users', 'run_threshold_pace')
+    op.drop_column('users', 'lthr')
+    op.drop_column('users', 'ftp')
+    
+    # Remove TSS column from activities table
+    op.drop_column('activities', 'tss')
+    
+    # Remove migration record
+    connection = op.get_bind()
+    connection.execute(text("DELETE FROM migrations WHERE id = 6"))