fix+feat(everything): lot of things

backend/migrations/README.md

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+# Migrations Alembic
+
+Ce dossier contient les migrations de base de données gérées par Alembic.
+
+## Commandes utiles
+
+### Créer une nouvelle migration
+```bash
+alembic revision --autogenerate -m "Description de la migration"
+```
+
+### Appliquer les migrations
+```bash
+alembic upgrade head
+```
+
+### Revenir en arrière d'une migration
+```bash
+alembic downgrade -1
+```
+
+### Voir l'historique des migrations
+```bash
+alembic history
+```
+
+### Voir la migration actuelle
+```bash
+alembic current
+```
+
+### Créer une migration vide (sans autogenerate)
+```bash
+alembic revision -m "Description de la migration"
+```
+
+## Notes importantes
+
+- Les migrations sont automatiquement détectées depuis les modèles SQLAlchemy dans `models/`
+- Ne modifiez jamais manuellement les fichiers de migration existants
+- Testez toujours les migrations en développement avant de les appliquer en production
+- En cas de problème, vous pouvez toujours revenir en arrière avec `alembic downgrade`
+

backend/migrations/env.py

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+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# 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
+from config.database import Base
+from config.settings import settings
+
+# Import all models so Alembic can detect them
+from models import (
+    User,
+    Event,
+    EventParticipation,
+    Album,
+    Media,
+    MediaLike,
+    Post,
+    PostMention,
+    PostLike,
+    PostComment,
+    Vlog,
+    VlogLike,
+    VlogComment,
+    Notification,
+    SystemSettings,
+    Information,
+    Ticket
+)
+
+# set the sqlalchemy.url from settings
+config.set_main_option("sqlalchemy.url", settings.DATABASE_URL)
+
+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.
+
+
+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/migrations/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, 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:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
+

backend/migrations/versions/89527c8da8e1_add_is_private_field_to_events.py

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+"""Add is_private field to events
+
+Revision ID: 89527c8da8e1
+Revises: 
+Create Date: 2026-01-25 18:43:00.881982
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '89527c8da8e1'
+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:
+    # ### commands auto generated by Alembic - please adjust! ###
+    # Ajouter la colonne avec nullable=True d'abord
+    op.add_column('events', sa.Column('is_private', sa.Boolean(), nullable=True))
+    # Mettre à jour toutes les lignes existantes avec False
+    op.execute("UPDATE events SET is_private = FALSE WHERE is_private IS NULL")
+    # Rendre la colonne non-nullable avec une valeur par défaut
+    op.alter_column('events', 'is_private',
+                    existing_type=sa.Boolean(),
+                    nullable=False,
+                    server_default='false')
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('events', 'is_private')
+    # ### end Alembic commands ###