"""kol_divergence table — talks-vs-trades cross-signal

Revision ID: 019
Revises: 018
Create Date: 2026-05-23
"""
from alembic import op
import sqlalchemy as sa

revision = "019"
down_revision = "018"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.create_table(
        "kol_divergence",
        sa.Column("id",           sa.Integer,  primary_key=True),
        # Which KOL + asset
        sa.Column("handle",       sa.String(64),  nullable=False, index=True),
        sa.Column("ticker",       sa.String(32),  nullable=False),
        # Content side (B-tier)
        sa.Column("post_id",      sa.Integer,  sa.ForeignKey("kol_posts.id"), nullable=False),
        sa.Column("post_action",  sa.String(16), nullable=False),  # buy|sell|bullish|bearish
        sa.Column("post_conviction", sa.Float, nullable=True),
        sa.Column("post_at",      sa.DateTime, nullable=False),    # post published_at
        # On-chain side (A-tier)
        sa.Column("change_id",    sa.Integer,  sa.ForeignKey("kol_holding_changes.id"), nullable=False),
        sa.Column("onchain_action", sa.String(16), nullable=False),  # new_position|increased|decreased|closed
        sa.Column("usd_before",   sa.Float,    nullable=True),
        sa.Column("usd_after",    sa.Float,    nullable=True),
        sa.Column("onchain_at",   sa.DateTime, nullable=False),
        # Classification
        sa.Column("signal_type",  sa.String(16), nullable=False),  # divergence | alignment
        sa.Column("direction",    sa.String(8),  nullable=True),   # long | short (net conclusion)
        sa.Column("days_apart",   sa.Float,    nullable=True),     # abs days between post and onchain event
        sa.Column("created_at",   sa.DateTime, nullable=False, server_default=sa.func.now()),
        # Unique: one row per (post, change) pair so re-runs are idempotent
        sa.UniqueConstraint("post_id", "change_id", name="uq_kol_divergence_pair"),
    )
    op.create_index("ix_kol_divergence_handle_ticker", "kol_divergence", ["handle", "ticker"])
    op.create_index("ix_kol_divergence_signal_type",   "kol_divergence", ["signal_type"])
    op.create_index("ix_kol_divergence_created_at",    "kol_divergence", ["created_at"])


def downgrade() -> None:
    op.drop_table("kol_divergence")