server + getting sensor id + json in esp32

server/alembic/README

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+Generic single-database configuration.

server/alembic/env.py

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+import os
+import sys
+from logging.config import fileConfig
+
+from alembic import context
+from sqlalchemy import engine_from_config, pool
+
+# Add the project root to sys.path so that models can be imported.
+sys.path.insert(0, os.path.realpath(os.path.join(os.path.dirname(__file__), "..")))
+
+from app import create_app
+from models import db
+
+# Create the Flask application to get the database URI.
+app = create_app()
+
+# Alembic Config object.
+config = context.config
+
+# Override the sqlalchemy.url with the value from the Flask config.
+config.set_main_option("sqlalchemy.url", app.config["SQLALCHEMY_DATABASE_URI"])
+
+# Set up Python logging from the alembic.ini [loggers] section.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# Target metadata for 'autogenerate' support.
+target_metadata = db.metadata
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    Configures the context with just a URL and not an Engine.
+    """
+    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.
+
+    Creates an Engine and associates 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()

server/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"}

server/alembic/versions/7f92bfc47dfc_initial_tables.py

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+"""initial tables
+
+Revision ID: 7f92bfc47dfc
+Revises: 
+Create Date: 2026-09-11 17:08:42.232582
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '7f92bfc47dfc'
+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('sensor',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=128), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('name')
+    )
+    op.create_table('sensor_readout',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('sensor_id', sa.Integer(), nullable=False),
+    sa.Column('type', sa.String(length=64), nullable=False),
+    sa.Column('value', sa.Float(), nullable=False),
+    sa.Column('timestamp', sa.DateTime(), nullable=True),
+    sa.ForeignKeyConstraint(['sensor_id'], ['sensor.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('sensor_readout')
+    op.drop_table('sensor')
+    # ### end Alembic commands ###