Phase 1: scaffold, data models, selection logic, tests

Flask application skeleton with SQLAlchemy models for courses (including
per-course settings), students, enrollments, opt-outs, and calls; the
weighted and cycle selection logic ported from the manual coldcall
scripts; alembic migrations; and a pytest suite covering selection
behavior and the model query helpers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

migrations/README

@@ -0,0 +1 @@
+Generic single-database configuration.

migrations/env.py

@@ -0,0 +1,83 @@
+import os
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+from coldcall_lti.db import Base
+from coldcall_lti import models  # noqa: F401  (populates Base.metadata)
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# The database URL comes from the same environment variable the app
+# uses, falling back to the value in alembic.ini.
+if os.environ.get("COLDCALL_DATABASE_URL"):
+    config.set_main_option("sqlalchemy.url", os.environ["COLDCALL_DATABASE_URL"])
+
+# 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)
+
+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()

migrations/script.py.mako

@@ -0,0 +1,26 @@
+"""${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"}

migrations/versions/ad7e3f5ea2f3_initial_schema.py

@@ -0,0 +1,90 @@
+"""initial schema
+
+Revision ID: ad7e3f5ea2f3
+Revises: 
+Create Date: 2026-07-31 16:23:01.164289
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'ad7e3f5ea2f3'
+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! ###
+    op.create_table('courses',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('lti_context_id', sa.String(length=255), nullable=False),
+    sa.Column('lti_deployment_id', sa.String(length=255), nullable=True),
+    sa.Column('title', sa.String(length=255), nullable=True),
+    sa.Column('weight_factor', sa.Float(), nullable=False),
+    sa.Column('selection_mode', sa.String(length=16), nullable=False),
+    sa.Column('show_assessments', sa.Boolean(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('lti_context_id')
+    )
+    op.create_table('students',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('canvas_user_id', sa.String(length=255), nullable=False),
+    sa.Column('name', sa.String(length=255), nullable=True),
+    sa.Column('sortable_name', sa.String(length=255), nullable=True),
+    sa.Column('email', sa.String(length=255), nullable=True),
+    sa.Column('avatar_url', sa.String(length=1024), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('canvas_user_id')
+    )
+    op.create_table('calls',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('course_id', sa.Integer(), nullable=False),
+    sa.Column('student_id', sa.Integer(), nullable=False),
+    sa.Column('session_date', sa.Date(), nullable=False),
+    sa.Column('status', sa.String(length=16), nullable=False),
+    sa.Column('assessment', sa.String(length=32), nullable=True),
+    sa.Column('note', sa.Text(), nullable=True),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['course_id'], ['courses.id'], ),
+    sa.ForeignKeyConstraint(['student_id'], ['students.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('enrollments',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('course_id', sa.Integer(), nullable=False),
+    sa.Column('student_id', sa.Integer(), nullable=False),
+    sa.Column('role', sa.String(length=32), nullable=False),
+    sa.Column('active', sa.Boolean(), nullable=False),
+    sa.ForeignKeyConstraint(['course_id'], ['courses.id'], ),
+    sa.ForeignKeyConstraint(['student_id'], ['students.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('course_id', 'student_id')
+    )
+    op.create_table('optouts',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('course_id', sa.Integer(), nullable=False),
+    sa.Column('student_id', sa.Integer(), nullable=False),
+    sa.Column('date', sa.Date(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=False),
+    sa.ForeignKeyConstraint(['course_id'], ['courses.id'], ),
+    sa.ForeignKeyConstraint(['student_id'], ['students.id'], ),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('course_id', 'student_id', 'date')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('optouts')
+    op.drop_table('enrollments')
+    op.drop_table('calls')
+    op.drop_table('students')
+    op.drop_table('courses')
+    # ### end Alembic commands ###