feat: initial corvid — standalone ticket service extracted from homelab-dashboard

Extracts the ticket/attachment system into a reusable pip-installable package.
Centralises homelab MCP server (tickets, attachments, system logs) here.

- corvid package: models, router (make_router factory), config, standalone main
- Alembic migration chain for fresh standalone deployments
- Docker Compose for standalone deployment (port 8090)
- mcp_server.py: moved from homelab-dashboard, CORVID_REPO_PATH configurable

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

alembic/env.py

@@ -0,0 +1,33 @@
+import asyncio
+from logging.config import fileConfig
+
+from sqlalchemy.ext.asyncio import create_async_engine
+
+from alembic import context
+
+alembic_cfg = context.config
+
+if alembic_cfg.config_file_name is not None:
+    fileConfig(alembic_cfg.config_file_name)
+
+from corvid import config as app_config
+from corvid.models import Base  # noqa: E402 — registers models
+
+target_metadata = Base.metadata
+
+
+def do_run_migrations(connection):
+    context.configure(connection=connection, target_metadata=target_metadata)
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+async def run_async_migrations():
+    engine = create_async_engine(app_config.DATABASE_URL)
+    async with engine.begin() as conn:
+        await conn.run_sync(do_run_migrations)
+    await engine.dispose()
+
+
+run_migrations_online = lambda: asyncio.run(run_async_migrations())
+run_migrations_online()

alembic/script.py.mako

@@ -0,0 +1,24 @@
+"""${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: 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"}

alembic/versions/0001_tickets_schema.py

@@ -0,0 +1,53 @@
+"""tickets and ticket_attachments initial schema
+
+Revision ID: 0001
+Revises:
+Create Date: 2026-05-25
+"""
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+revision: str = "0001"
+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:
+    op.create_table(
+        "tickets",
+        sa.Column("id",             sa.Integer(),              primary_key=True),
+        sa.Column("guid",           sa.String(36),             nullable=False, unique=True),
+        sa.Column("user",           sa.String(64),             nullable=False, server_default="kevin"),
+        sa.Column("title",          sa.String(256),            nullable=False),
+        sa.Column("description",    sa.Text(),                 nullable=True),
+        sa.Column("submitted_at",   sa.DateTime(timezone=True), nullable=False),
+        sa.Column("status",         sa.String(16),             nullable=False, server_default="open"),
+        sa.Column("type",           sa.String(16),             nullable=False, server_default="feature"),
+        sa.Column("parent_id",      sa.Integer(),
+                  sa.ForeignKey("tickets.id", ondelete="SET NULL"), nullable=True),
+        sa.Column("effort",         sa.Integer(),              nullable=True),
+        sa.Column("startup_script", sa.Text(),                 nullable=True),
+    )
+    op.create_index("ix_tickets_parent_id", "tickets", ["parent_id"])
+
+    op.create_table(
+        "ticket_attachments",
+        sa.Column("id",         sa.Integer(),              primary_key=True),
+        sa.Column("ticket_id",  sa.Integer(),
+                  sa.ForeignKey("tickets.id", ondelete="CASCADE"), nullable=False),
+        sa.Column("title",      sa.String(256),            nullable=False),
+        sa.Column("content",    sa.Text(),                 nullable=False),
+        sa.Column("created_by", sa.String(64),             nullable=False, server_default="kevin"),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
+    )
+    op.create_index("ix_ticket_attachments_ticket_id", "ticket_attachments", ["ticket_id"])
+
+
+def downgrade() -> None:
+    op.drop_index("ix_ticket_attachments_ticket_id", table_name="ticket_attachments")
+    op.drop_table("ticket_attachments")
+    op.drop_index("ix_tickets_parent_id", table_name="tickets")
+    op.drop_table("tickets")