-- M2: long-term memory items (DevDocs/design/03 §0/§3).
-- Canonical schema reference; internal/runtime/memory reuses this table.
CREATE TABLE IF NOT EXISTS memory_items (
    id                  TEXT PRIMARY KEY,
    persona_id          TEXT NOT NULL,
    role_id             TEXT NOT NULL DEFAULT '',
    scope               TEXT NOT NULL,
    kind                TEXT NOT NULL,
    content             TEXT NOT NULL,
    tags                TEXT NOT NULL DEFAULT '[]',
    confidence          REAL NOT NULL DEFAULT 1.0,
    source_conversation TEXT NOT NULL DEFAULT '',
    created_at          TEXT NOT NULL,
    updated_at          TEXT NOT NULL,
    decay_weight        REAL NOT NULL DEFAULT 1.0
);

CREATE INDEX IF NOT EXISTS idx_memory_items_persona_id
    ON memory_items (persona_id);
CREATE INDEX IF NOT EXISTS idx_memory_items_persona_id_created_at
    ON memory_items (persona_id, created_at);